- Museum number
Minute-repeating chronograph watch with calendar.
- Production date
Diameter: 48.80 millimetres (dial)
Thickness: 13.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1910
Triple complicated watch movement with calendar work, minute repeating and chronograph work and a club tooth lever escapement
Case: Missing but was a hunter
Dial and Hands: Flat canister dial with 1/5 seconds marked on the minute circle. Four sunk subsidiary dials; at 9 0'clock the day, at 12 the date, at 3 the month, at 6 the seconds dial with at its centre the phases of the moon mask and aperture. All names in English. Blued-steel hands, the hour and minute of spade design.
Ebauche Marks: 57968
Frame: Bar layout, the repeating work housed beneath its own bridge. The calendar work on a sub plate.
Barrel and Mainspring:
Going Barrel I. diameter 15.2 mm., height 2.4 mm.
Mainspring height 2.2 mm., thickness 0.18 mm
Arbor: diameter 4.9 mm., snailed.
Hooking: a pressed in tongue
Train: wheels gilded one side with five crossings, except for the escape wheel which has four.
Jewelled: from the fourth onwards the jewels rubbed in, ruby endstones to the balance. Also the rear pivot of the centre seconds arbor jewelled.
Escapement: Club tooth lever, straight line layout, short lever, double roller, impulse pin D shaped. Pallet stones exposed, the acting faces flat. The escape wheel steel, the teeth chamfered.
A mixed escapement.
Number of teeth embraced 3½
Balance and Spring: Monometallic balance with Elinvar spring. Balance diameter 14.7 mm., height 1.05 mm. Flat spiral spring with 14 turns and with terminal curve.
Means of Regulation: Index on the balance cock registering against a divided scale with engraved 'F S' and 'R A'.
Train Counts and Beat Rate:
Great wheel (barrel) 84
Centre wheel 80 pinion 12
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 12
Minute wheel 36, minute pinion 10
hour wheel 26
Winding System: Side lever set positive keyless work.
Repeating work: Slide operated. No all-or-nothing device. Control of the repeating train by a silent speed regulator. The slide isolated from the winding rack. See Appendix.
Calendar work: Two intermediate driving wheels of 52, one carrying a pin indexing the days and moon disc, the other indexing the date disc
Date (star) wheel 31
Day (star) wheel 7
Moon disc 59
The month indication has to be indexed manually
Chronograph work: Normal castle wheel, operated by a pusher situated in the 2 o'clock position.
Dimensions: Movement diameter 50.0 mm., height 14.0 mm
Provenance: Formerly in the Ilbert collection. Purchased by Ilbert from Robert Gardner 30.9.1931.
- 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.1262 (Ilbert Collection)
Previous owner/ex-collection number: L104 (Ilbert Ledger)