Other Instrument Numbers This section has been included at the instigation of a regular contributor to these pages Hugh Clayton [HC]. He has encountered a number of other instruments manufactured by Watson, bearing serial numbers. This section is included in the hope that some sort of relationship might eventually be established between various departments numbering systems.

See also The objective list | Return to Microscope Serial Nos.

Instrument Number | Model/Type | Date (if known) | Notes
- | English Target Pistol | - | Marked on top of barrel - 'W. Watson & Sons, 308 & 313 High Holborn, London'. Marked on side of frame 'W. Tranters patent 62097'. [HC]
884 | 3 inch Refractor Telescope | - | [HC]
1250 | 3 inch Refractor Telescope | - | Built-in table stand [HC]
1345 | Student Telescope | - | 4ft long. Mahogany tripod [CG]
2221 | 5 inch 'Century' Refractor Telescope | - | Keele University [HC]
2467 | Camera Lens | - | W. Watson & Sons London. 3.9 inch f11.3 Holos wide-angle (Brass) [HC]
2489 | Compass | - | [HC]
2539 | Camera Lens | - | W. Watson & Sons London. 51/8inch Holostigmat Coated Ser. 1A.2539. Front and Back assembly removable 8 inch/Ilex shutter 51/8 inch/f4.6-f45 or 8/f8.5-f64 with Acme Speed Dial 1-1/300 (8 speed), T&B plus Cap plus Locking ring. DA Socket. Black/Chrome/Nickel.[HC]
4763 | Marine Telescope | - | W. Watson & Sons. [HC]
7431 | Binoculars 6x30 | - | W. Watson & Sons (Opticians to H.M. Government) x6 [HC]
7437 | WWII Military x6 Binoculars | - | W. Watson & Sons Ltd. London. Case Marked with Holborn address and Optician to HM Government [HC]
61296 | Binoculars | 1917 | W. Watson & Son 1917 Binoculars Prismatic No.3 (Mk I) x6 [HC]
72101 | 8x30 Binoculars | - | Marked 'Lynceus x8 W. Watson & Sons London and Barnet'. [HC]