- Museum number
MOVEMENT AND DIAL OF A LEVER WATCH.
3/4-plate; fusee; Harrison's maintaining power.
Savage-two-pin lever escapement.
White enamel dial; sunk subsidiary seconds.
Blued steel spade hands; seconds hand missing.
- Production date
Diameter: 39.80 millimetres (back-plate)
Diameter: 44.40 millimetres (dial)
Thickness: 10.30 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by W. C. Shaw
Glasgow, c. 1880
Movement of a ratchet tooth lever watch with a Savage two-pin fork and roller action.
Signature: 'W.C. SHAW 92 BUCHANAN STREET GLASGOW', on the dial and 'W.C. Shaw. Glasgow. No 5034,' on the back plate.
Dial & Hands: A flat dial with a sunk subsidiary seconds dial. The outer circle, calibrated for minutes, is further divided into quarters between the minute marks. In the counter-enamel, the number 34. Blued-steel spade pattern hands, the seconds hand missing.
Dial-plate: None intended, the dial is pinned directly to the front plate.
Dust-cap: None intended.
Ebauche Marks: 16 1
Frame: 3/4-plate construction, the back plate supported by four turned pillars and secured by screws. Separate bridges on the front plate for the fusee pivot, the third and fourth wheels and the escapement. A separate screwed on bush for the rear fusee pivot. The balance cock is plain.
Fusee, Barrel and Mainspring:
Fusee: 4 1/3-turn fusee with Harrison's maintaining power with a steel maintaining ratchet wheel.
Barrel: internal diameter 15.8 mm, height 2.8 mm.
Mainspring: height 2.6 mm, thickness 0.23 mm.
Barrel Arbor: diameter 5.0 mm, snailed
Hooking: originally square but now round.
Train: A high quality train with high-count pinions. All the brass wheels are gilded, the centre, third and fourth wheels with six crossings.
Jewelling: Jewelled bearings for the fourth wheel onwards, the jewel in the front plate for the fourth is rubbed in, the remainder are in screwed settings. The escapement with ruby endstones except for a diamond in the balance cock.
Escapement: An acute-angle layout Savage two-pin lever escapement, the three pins are gold with a plain notch in the steel impulse roller. The is wear in the fork but none elsewhere. The enclosed pallet stones have convex acting faces.
An equal impulse escapement.
No. of teeth embraced 32.
Balance and Spring: A split bimetallic balance with gold compensation and quarter screws, balance diameter 17.3 mm, thickness 1.25 mm. A flat spiral blued-steel balance spring of 12 turns pinned to a polished steel stud screwed to the balance cock.
Means of regulation: An index on the balance cock registers against a divided scale with 'SLOW' and 'FAST' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 80 (fusee)
Centre wheel 80 pinion 12
Third wheel 75 pinion 10
Fourth wheel 60 pinion 10
Escape wheel 15 pinion 8
Beat rate: 13,500.
Motion work: cannon pinion 12
minute wheel 48, minute pinion 14
hour wheel 42
Key operated hand setting via a square on the rear of the hollow centre arbor.
Winding Mechanism: Key wound.
Movement: diameter 44.4 mm, height 10.3 mm, pillar height 3.1 mm.
Provenance: Formerly in the Ilbert Collection. Ilbert purchased this watch from Collett 21/1/1933.
- Not on display
Latest: 3 (2017)
- Acquisition date
- Acquisition notes
- Following the successful acquisition of the celebrated Ilbert collection of clocks (1958,1006 collection), prints and other related materials made possible by the generous donation of funds by Gilbert Edgar CBE Ilbert's watches were then acquired using funds provided by Gilbert Edgar, public donations and government funds.
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1145 (Ilbert Collection)
Previous owner/ex-collection number: M332 (Ilbert Ledger)