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Objective Dating Table The following table lists those objectives examined to date. There really is not enough data here to arrive at any sort of conclusion. The key to arriving at a reasonable dating system is more data. It certainly looks as if batches of numbers were released for particular styles of objective, but the batches not in number/chronological order, though the objectives within each batch probably are in chronological order. The column representing the Name Inscription has the following codes used:- A - W. Watson & Son B - W. Watson & Sons C - W. Watson & Sons Ltd D - Overlapping Ws E - WATSON N - No inscription U - Unknown (not examined)

Objective Number | Working distance | Type | Date (if known) | Name | Notes
300 | 8mm N.A. 0.65 | Holos | - | B | Brass. 160mm Tube length
458 | 16mm | Holos | - | B | 250mm Tube Length All Bright Brass
1046 | 2mm N.A. 1.37 | Apo. | - | C | Brass.
1062 | 1/12" | Versalic | - | C | Brass.
1080 | 1/6 | No type | - | C | Bright Brass and nickel - Tapered Style
1107 | 8mm N.A. 0.65 | Apo. | - | C | Brass. 200mm Tube length
1550 | 1/12 | Versalic | - | C | Black/chrome/brass - Tapered Style
2355 | 2mm oil Imm. | Holos | - | C | Brass and Nickel
2378 | 1/12th | Holos | - | C | Brass and Nickel
2416 | x40 NA .65 | Para | - | E | Service III
3098 | O.I. x100 | Para 1.30 PHASE | - | E | Service III
3657 | 4mm | Holos | 11th August 1941 | C | All bright Brass
3658 | 1/6" | - | - | C | Brass. Metalurgical
3661 | x40 N.A. 0.65 | Para | - | E | Phase,green ring, short.
3684 | 1/6" N.A. 0.74 | Para | - | C | Brass/Chrome. Tapered
4314 | 1/12 | Versalic | - | C | Black and Chrome - Tapered Style
4582 | 1/6 | Para | - | D | Black and Nickel[HC]
4969 | x40 | Para 0.65 | - | E | Service III
5036 | 1/6 | Para | - | - | Black and Brass
5288 | x40 NA .65 | Para | - | E | Service III
5352 | O.I. x100 NA 1.30 | Para | - | E | Service III
5588 | 1/6" | Para | - | D | Brass/Chrome.
5594 | 1/6" | Para | - | D | Brass/Chrome.
6135 | x100 N.A. 1.30 | Para | - | E | Oil, red ring.
6445 | 25mm | Holos | 11th August 1941 | C | All bright Brass
7212 | 1/6" N.A. 0.74 | Para | - | C | Brass/Chrome. Tapered
7248 | 1/6" | Para | - | D | Brass/Chrome. Tapered
7355 | 16mm | Holos | 11th August 1941 | C | All bright Brass
8545 | 16mm | Holos | - | C | All Bright Brass
8649 | 4mm N.A. 0.95 | Holos | - | C | Brass. 160mm Tube length
9073 | x60 N.A. 0.85 | Para | - | E | Gold ring.
9108 | 1/6 | Para | - | D | Brass and Nickel
9183 | 1/12 | Utility | - | - | -
9276 | 2in. | Holos | - | C | All Bright Brass
9317 | 1/12 oi | Utility | - | U | -
9635 | 1/6 | Para | - | D | Brass and Chrome
9924 | 1/12" OI | Utility | - | D | Black and Chrome
10133 | 1/12 | Utility | - | D | Black and Chrome
10240 | 1/6th | Para | - | - | -
10552 | 1/12in. | Utility | - | D | Black & Chrome- Tapered pattern
10561 | 1/12" | Utility | - | D | Black/Chrome. Oil. Corr. Collar
10564 | 1/12" N.A. 1.25 | Utility | - | - | Black/Chrome.
10638 | 1/4 | Para | - | D | Black and Nickel[HC]
10830 | 1/12 | Para | 7th October 1946 | U | -
11663 | 2in. | Para | - | C | All Black - Tapered pattern
11690 | 1/12in. | Utility | - | D | Black & Chrome- Tapered pattern
11933 | x96 1/12" N.A. 1.25 | Utility | - | - | Black/Chrome. Oil
12238 | 1/12" OI | Versalic | - | C | Black and Chrome
12495 | x40 NA .65 | Para Phase | - | E | MicroSystem 70
12667 | x40 N.A. 0.85 | Apo | - | D | Turquoise ring.
12790 | x40 N.A. 0.65 | Para | - | D | Phase, green ring.
12845 | 1/12" OI | Versalic | - | C | Black and Chrome
12988 | oil x100 NA 1.30 | Para | - | E | Service III
13192 | 1/6" N.A. 0.70 | Para | - | D | Brass.
13290 | oil x90 NA 1.30 | Fluorite Phase | - | E | MicroSystem 70
13305 | x40 | Para | - | D | MicroSystem 70
13462 | x100 N.A. 1.30 | Para | - | D | Oil, red ring.
13615 | 16mm. N.A. .28 | - | - | - | Black and Brass
13679 | 4mm. N.A. .70 | - | - | - | Black and Brass
13764 | oil x90 NA 1.30 | Fluorite Phase | - | E | MicroSystem 70
14354 | 1/6" N.A. 0.70 | Para | - | D | Brass. Tapered
14695 | 1/12 oil. imm. | Versalic | - | - | -
14768 | x40 na. .63 | Para | - | D | Microsystem 70
14936 | 1/12" | Versalic | - | C | Black/Chrome. Oil.
15069 | x100 N.A. 1.30 | Para | - | D | Oil, red ring.
15195 | x90 na. 1.3 oil | Fluorite | - | D | Microsystem 70
15498 | 2/3 | Para | 30th September 1930 | U | -
15504 | 1/6 | Para | 30th September 1930 | C | -
15718 | 1/12 oil imm. | Versalic | - | C | Black and Nickel with iris
15743 | x90 N.A. 1.37 | Apo | - | D | Oil, red ring.
16153 | 2/3rds | Para | - | - | -
16456 | oil x100 NA 1.30 | Para | - | E | MicroSystem 70
16640 | 1/12" OI | Versalic | - | C | Black and Chrome
16642 | 1/12" OI | Versalic | - | C | Black and Chrome
16648 | 1/12" OI | Versalic | - | C | Black and Chrome
16874 | 1/12" OI | Versalic | - | C | Black and Chrome
16876 | 1/12" OI | Versalic | - | C | Black and Chrome
16877 | 1/12" OI | Versalic | - | C | Black and Chrome
16880 | 1/12" OI | Versalic | - | C | Black and Chrome
16939 | 1/12" OI | Versalic | - | C | Black and Chrome
16940 | 1/12" OI | Versalic | - | C | Black and Chrome
16997 | 1/12" OI | Versalic | - | C | Black and Chrome
17001 | 1/12" OI | Versalic | - | C | Black and Chrome
17116 | 2/3 in. | Para | 26th November 1934 | - | -
17223 | 1/12" OI | Versalic | - | C | Black and Chrome
17249 | 1/12" OI | Versalic | - | C | Black and Chrome
17269 | 1/12" OI | Versalic | - | C | Black and Chrome
17274 | 1/12" OI | Versalic | - | C | Black and Chrome
17559 | 1/12" OI | Versalic | - | C | Black and Chrome
17602 | 1/12" OI | Versalic | - | C | Black and Chrome
17935 | 1/6 in. | Para | 26th November 1934 | - | -
17949 | x50 N.A. 0.95 | Fluo. | - | D | Oil, phase gold ring.
18004 | 1/6 | Para | 10th September 1935 | C | Black and Chrome - Tapered Style
18018 | 1/12" OI | Versalic | - | C | Black and Chrome
18097 | 1/12" OI | Versalic | - | C | Black and Chrome
18158 | 1/12" OI | Versalic | - | C | Black and Chrome
18172 | 1/12 | Oil | 24th May 1946 | C | Black and Chrome - Tapered Style
18197 | 2/3 | Para | 10th September 1935 | C | Black and Chrome - Tapered Style
18333 | oil x90 NA 1.30 | Fluorite | - | E | MicroSystem 70
18376 | x90 N.A. 1.30 | Fluo. | - | D | Oil, red ring.
18587 | 1/6 in. | Para | 22nd November 1935 | - | Black and Brass
18705 | 2/3 in. | Para | 22nd November 1935 | - | Black and Brass
19634 | x40 NA .65 | Para | - | E | MicroSystem 70
20475 | x40 Phase | Para | - | E | Microsystem 70
20695 | 1/12 | Para | 26th April 1949 | U | -
20755 | 1/12" OI | Versalic | - | C | Black and Chrome
20756 | 1/12" OI | Versalic | - | C | Black and Chrome
20757 | 1/12" OI | Versalic | - | C | Black and Chrome
20763 | 1/12" OI | Versalic | - | C | Black and Chrome
21685 | 1/12 oil imm. | Versalic | - | C | Black and Chrome - Tapered Style
21695 | 1/6" N.A. 0.70 | Para | - | - | Brass.
22043 | 1/6" N.A. 0.70 | Para | - | D | Brass. Tapered
22074 | 2/3" | Para | - | D | Brass.
22173 | 1/12 oil imm. | Versalic Metallurgy | - | C | Black and Chrome - Short - Tapered Style
22272 | 1/12" OI | Versalic | - | C | Black and Chrome
22809 | x100 N.A. 1.30 | Para | - | D | Oil, red ring.
24920 | 2/3 | Para | - | D | Brass and Chrome - Tapered Style
25367 | 1/6 | Para | - | D | All Bright Brass - Tapered Style
26312 | 2/3" | Para | - | - | Brass/Chrome.
26816 | 1/6 | Para | 2nd January 1941 | - | -
27014 | 2/3 | Para | 2nd January 1941 | - | -
32327 | 2/3 | Para | - | D | Brass and Nickel
32976 | 1/6 | Para | - | D | All Bright Brass
33144 | 2/3 | Para | - | D | Brass and nickel
34632 | 2/3" | Para | - | D | Brass/Chrome.
35281 | 2/3 | Para | - | D | Brass and nickel
36636 | 2/3 | Para | 24th May 1946 | D | -
36751 | 1/6 | Para | 24th May 1946 | D | Black and Chrome - Tapered Style
38381 | 2/3 | Para | - | D | Black and Chrome - Tapered Pattern
38978 | 1/6 | Para | - | D | Black and Chrome - Tapered Pattern
39613 | X42 na .20 | Para | - | U | -
39646 | 1/6 | Para | - | D | Black and Brass - Tapered Pattern
40320 | 2/3 x10 na .28 | Para | - | U | -
41119 | 1/6 | Para | - | D | Black and Chrome - Tapered Style
41081 | 1/6 | Para | - | D | Black and Chrome - Tapered Style
42019 | 2/3 | Para | - | D | Black and Chrome - Tapered Style
42121 | 1/6 | Para | - | D | Black and Chrome - Tapered Style
42187 | 16mm | Para | 29th May 1959 | U | -
42249 | 1/6 | Para | 12th February 1948 | U | -
42572 | 40mm | Para | - | E | Black and Chrome Service II style
43293 | 16mm | Para | - | E | Black and Chrome - Service II style
44204 | 4mm | Para | - | E | Black and Chrome - Service II style
44520 | 40mm | Para | - | E | Purple and Chrome - Bactil 60
44986 | 16mm | Para | - | E | Purple and Chrome - Bactil 60
45036 | 4mm | Para | - | E | Purple and Chrome - Bactil 60
45138 | 4mm | Para | 18.3.60 | - | .
45482 | 2mm | Para | - | U | -
46235 | 1/6 | Para | - | D | Black and Chrome - Tapered Pattern
46236 | 1/6 | Para | 14th December 1948 | U | Black and Chrome - Tapered Pattern
46287 | 40mm | Para | - | E | Black and Chrome Service II style
47324 | 2mm x100 | Para | - | E | Chrome Service II style
47522 | 1/6 | Para | 26th April 1949 | U | -
47855 | x10 | Para | - | U | -
48217 | 2/3 | Para | 26th April 1949 | U | -
48444 | 2/3 | Para | 12th February 1948 | U | -
48676 | x40 4mm N.A. 0.70 | Para | 26.10.60 | - | .
48812 | x4 40mm N.A. 0.13 | - | 26.10.60 | E | Black/Chrome.
50545 | 1/6 | Para | - | D | Black and Chrome Tapered Style
51715 | 4mm | Para | - | E | Black and Chrome Service II style
51779 | 4mm | Para | - | E | Black and Chrome Service II style
52148 | 40mm | Para | - | E | Black and Chrome Service II style
52506 | 1/6 | Para Metallurgy 22mm tube length | - | D | Black and Chrome - Tapered Style - Short
54867 | 16mm | Para | - | E | Black and Chrome Service II style
55302 | 16mm | Para | - | E | Black and Chrome Service II style
56474 | 40mm | Para | - | E | Black and Chrome Service II style
57763 | 1/6 | Para | 7th October 1946 | U | -
88657 | x10 | Para | - | U | -
99590 | x42 1/6" N.A. 0.70 | Para | - | D | Black/Chrome.
111224 | 4mm | Holos | - | C | All Silver Nickel
132360 | x5 Stereo Objectives | - | - | N | Grey, bayonet fitting. These objectives usually bear the same number as the stand they were supplied on, so it may be assumed that a Stereo stand existed with this number and such a stand number has been entered into the preceding table.
134678 | x5 Stereo Objectives | - | - | N | Grey, bayonet fitting. These objectives usually bear the same number as the stand they were supplied on, so it may be assumed that a Stereo stand existed with this number and such a stand number has been entered into the preceding table.
165624 | 1/6 | Argus | - | D | Black and nickel - Tapered Pattern
181133 | 1/6 | Argus | - | D | All black - Tapered Pattern
181137 | 1/6 | Argus | - | D | All black - Tapered Pattern
181140 | 1/6 | Argus | - | D | All black - Tapered Pattern
181142 | 1/6 | Argus | - | D | All black - Tapered Pattern
181162 | 2/3 | Argus | - | D | All black - Tapered Pattern
184067 | 1/6 | Argus | - | - | -
186346 | 2/3" | - | 11.3.37 | - | .
188612 | 1/6 | Argus | - | D | All black - Tapered Pattern
189167 | 1/6 | Argus | - | D | All Black - Tapered pattern
190759 | 2/3" | Argus | - | D | Black/Chrome.
193658 | 2/3 | Argus | - | D | All Black - Tapered pattern
197893 | 1/6 | Para | - | D | Black and Chrome - Tapered pattern
198575 | 1/6" N.A. 0.70 | - | - | D | Black/Chrome.
198875 | 2/3 | Para | - | D | Black and Chrome - Tapered pattern
198886 | 2/3 | Para | 14th December 1948 | U | Black and Chrome - Tapered pattern
200835 | 2/3 | Para | - | D | Black and Chrome - Tapered pattern
319763 | x40 | Para | - | U | -
499693 | x10 NA .30 | Para | - | E | Short, all chrome with coloured ring
516318 | x10 NA .30 | Para | - | E | Short, all chrome with coloured ring
525362 | oil x100 1.28 | Para | - | E | All chrome with coloured ring [HC]
557452 | x45 NA.0.65 | Para | - | E | All chrome with coloured ring [HC]
557908 | Oil x100 | Para 1.28 | - | E | All chrome with coloured ring
569813 | x10 N.A. 0.30 | - | - | - | Chrome. Blue ring
571878 | oil x100 NA 1.28 | Para | - | E | Short, all chrome with coloured ring
B1188 | x50 4mm N.A. 0.70 | Para | - | E | Black/Chrome.
B1523 | 25mm | Para | 5.1.51 | - | .
B1619 | x4 40mm N.A. 0.13 | - | - | E | .
B2385 | 6mm | Para | 5.1.51 | - | .
B3391 | 16mm | Para | - | U | Associated with stand 103692 (1950)
B4236 | 4mm | Para | - | U | Associated with stand 103692 (1950)
B5663 | 2mm | Para | 25th July 1951 | U | -
B5665 | 2mm | Para | - | U | -
B5667 | 2mm | Para | - | U | -
B5675 | 2mm | Para | 25th July 1951 | U | -
B5800 | 2mm | Para | - | U | -
B7173 | 2/3 | Para | 7th October 1946 | U | -
B7400 | 4mm | Para | 25th July 1951 | U | -
B7408 | 4mm | Para | 25th July 1951 | U | -
B8330 | 16mm | Para | - | E | Black and Chrome - Service II style
B8613 | 2mm | Para | - | U | -
B9223 | 16mm | Para | 25th July 1951 | U | -
B9226 | 16mm | Para | 25th July 1951 | U | -
B9273 | 40mm | Para | 25th July 1951 | U | -
B9315 | 40mm | Para | 25th July 1951 | U | -
B9495 | 4mm | Para | 13th November 1952 | U | -
B9614 | 40mm | Para | 13th November 1952 | U | -
B10328 | x40 4mm N.A. 0.70 | - | - | E | .
B10775 | x40 | Para | - | U | -
B10861 | 4mm | Para | - | E | Black and Chrome - Service II style
B10984 | 16mm | Para | 13th November 1952 | U | -
B11320 | 16mm | Para | - | E | Black and Chrome - Service II style
B11806 | 4mm | Para | - | E | Black and Chrome - Service II style
B12912 | 4mm | Para Metall. | - | E | Black and Chrome - Service II style
B13109 | 4mm | Para | 30th September 1952 | E | Black and Chrome - Service II style
B13190 | x40 4mm N.A. 0.70 | Para | - | E | Black/Chrome.
B13832 | 16mm | Para | - | E | Black and Chrome - Service II style
B14008 | 2mm | Para | 30th September 1952 | E | Black and Chrome - Service II style
B14281 | 2mm | Para | - | U | -
B14565 | 16mm | Para | 30th September 1952 | E | Black and Chrome - Service II style
B14621 | x10 16mm N.A. 0.28 | Para | - | E | Black/Chrome.
B14741 | 40mm | Para | 5th August 1953 | U | -
B16329 | x6 25mm N.A. 0.21 | - | - | - | Black/Chrome.
B16755 | 4mm | Para | - | E | Black and Chrome - Service II style
B17932 | 2mm | Para | 5th August 1953 | U | -
B18033 | 4mm | Para | 5th August 1953 | U | -
B18658 | 16mm | Para | 5th August 1953 | U | -
B19768 | 4mm | Para | - | E | Black and Chrome - Service II style
B21559 | 4mm | Para | - | E | Black and Chrome - Service II style
B21587 | 4mm | Para | 2nd September 1954 | E | Black and Chrome - Service II style
B21643 | 16mm | Para | - | E | Black and Chrome - Service II style
B21814 | 2mm | Para | 2nd September 1954 | E | Black and Chrome - Service II style
B21860 | 16mm | Para | 2nd September 1954 | E | Black and Chrome - Service II style
B23132 | 4mm | Para | - | E | Black and Chrome - Service II style
B24260 | 40mm | Para | - | E | Black and Chrome - Service II style
B24344 | 2mm | Para | 19.1.55 | - | .
B24434 | 4mm | Para | 19.1.55 | - | .
B24763 | 16mm | Para | 19.1.55 | - | .
B26422 | x40 | Para | 1956 | - | Black and Chrome - Service II style
B28728 | x4 40mm N.A. 0.13 | - | - | E | .
B29103 | 40mm | Para | 11th May 1956 | U | -
B29258 | x4 40mm N.A. 0.13 | - | - | E | .
B29464 | 4mm | Para | 11th May 1956 | U | -
B29602 | x100 oi | Para | - | U | -
B29744 | 2mm | Para | 11th May 1956 | U | -
B29774 | 50mm | Para | - | E | Black and Chrome Service II style
B30308 | 16mm | Para | 11th May 1956 | U | -
B30487 | x10 | Para | 1956 | - | Black and Chrome - Service II style
B30851 | 2mm | Para | 10th August 1956 | U | -
B31029 | 4mm | Para | 10th August 1956 | U | -
B31412 | 16mm | Para | 10th August 1956 | U | -
B31953 | 2mm | Para | - | E | Chrome Service II style
B32211 | 16mm | Para | - | E | Black and Chrome - Service II style
B32816 | 4mm | Para | - | E | Black and Chrome - Service II style
B33309 | 25mm | Para | - | E | Black and Chrome - Service II style
B33445 | 22mm | Para | - | E | Black and Chrome Service II style
B33547 | 2mm | Para | - | E | Chrome Service II style
B33569 | 2mm | Para | - | E | Chrome Service II style
B33570 | 2mm | Para | - | E | Chrome Service II style
B33582 | 2mm | Para | - | E | Chrome Service II style
B33610 | 2mm | Para | - | E | Chrome Service II style
B33619 | 2mm | Para | - | E | Chrome Service II style
B33634 | 2mm | Para | - | E | Chrome Service II style
B33646 | 2mm | Para | - | E | Chrome Service II style
B33649 | 2mm | Para | - | E | Chrome Service II style
B33862 | 2mm | Para | - | E | Chrome Service II style
B34719 | 2mm | Para | - | E | Chrome Service II style
B34741 | 2mm | Para | - | E | Chrome Service II style
B37878 | 2mm | Para | 29th May 1959 | U | -
B38447 | x40 4mm N.A. 0.70 | - | - | E | .
B41314 | 4mm | Para | 29th May 1959 | U | -
C5105 | 2mm | Para | - | - | All steel - Service II style [HC]
C7854 | 4mm | Para | - | E | Chrome - Service II style
C8318 | 4mm N.A. 0.70 | Para | - | E | .
C10292 | 4mm | Para | - | E | Chrome - Service II style
C10586 | 2mm | Para | - | E | Chrome - Service II style
C10588 | 2mm | Para | - | E | Chrome - Service II style
C10593 | 2mm | Para | - | E | Chrome - Service II style
E1293 | 2mm | Fluo. | 18.3.60 | - | .
E1467 | x10 16mm N.A. 0.30 | Para | - | - | Black/Chrome.
E3648 | x50 3.6mm N.A. 0.95 | - | - | E | Chrome. Oil. Fluorite
E3762 | x90 2mm N.A. 1.30 | - | - | E | Chrome. Oil. Fluorite
E3819 | 3.6mm | Fluorite | - | E | -
E3886 | 3.6mm | Fluorite x50 Oil. Imm. NA .95 | - | E | -
E3944 | 16mm | Fluo. | 18.3.60 | - | .
E3972 | 16mm | Fluo. | 18.3.60 | - | System 70 type.