- Museum number
Diameter: 43.50 millimetres (dial)
Thickness: 12 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1891
Minute repeating watch movement with club tooth lever escapement
Dial and Hands: Flat canister dial with a sunk subsidiary seconds. Blued-steel spade hands, blued-steel seconds hand - not original
Ebauche Marks: 18392
Frame: Bar layout. The repeating train under its own bridge. Under the cocks is stamped 2. The pallet bridge stamped 1 and the barrel bridge is stamped 18392.
Barrel and Mainspring:
Going barrel I. diameter 15.7 mm height 2.8 mm.
Mainspring. height 2.6 mm thickness 0.21 mm.
Arbor: diameter 5.3 mm., snailed.
Train: Brass wheels gilded one side, with 5 crossings, except for the escape wheel which has 4.
Jewelled: from the third onwards in the back plate and from the fourth pivot in the front plate. Ruby endstones for the balance pivots. The jewels rubbed in, that for the fourth in the front plate a replacement.
Escapement: Club tooth lever, straight line layout, short lever, double roller, impulse pin elliptical, a mixed escapement. Pallet stones exposed. Escape wheel steel teeth chamfered. Pallet staff screwed in.
No of teeth embraced 3 ½.
Balance and Spring: A bimetallic balance but not split. Balance diameter thickness. Blued-steel flat spiral spring with 17 turns and with a terminal curve.
Means of Regulation: Index on the balance cock registering against a divided scale with engraved 'FAST SLOW'
Train Counts and Beat Rate:
Great wheel (barrel) 80
Centre wheel 80 pinion 10
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 12
Minute wheel 36, minute pinion 10
hour wheel 40.
Winding System: Side lever set, positive keyless work
Repeating work: Lever wound, with no all-or-nothing device, the speed controlled by a silent speed regulator (see Appendix 0-0 for details). A divided slide is fitted. The surprise actuating piece is in constant contact with the surprise piece at each quarter.
Dimensions: Movement diameter 44.7 mm., height 12.4 mm
Provenance: Formerly in the Ilbert collection. Ilbert purchased this in the Caledonian market 7.4.1933.
- Not on display
Latest: 3 (2017)
2 (Feb 1995)
- 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.1255 (Ilbert Collection)
Previous owner/ex-collection number: N25 (Ilbert Ledger)