- Museum number
Lever escapement; small.
Diameter: 27.80 millimetres (dial)
Thickness: 8.20 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, Early 20th century
Minute repeating fob watch movement with going barrel and a club tooth lever escapement.
Case: Missing but was cased as a hunter.
Dial and Hands: Flat canister dial, the minutes and seconds numerals marked in red. A sunk subsidiary seconds dial. The hour numerals Arabic. The spade hands of blued-steel. Seconds hand missing.
Ebauche Marks: 11109.
Frame: Bar movement. The barrel effectively hanging but nevertheless supported at the front plate end by a cock. The repeating work with its own cocks and bridge with the lower pivot of the hammer nearest the barrel bridge supported by a cock fixed to this bridge. A steel pallet bridge.
Barrel and Mainspring: Geneva stopwork.
Going barrel I. diameter 8.6 mm., height 1.9 mm.
Mainspring: height 1.8 mm., thickness 0.0875 mm.
Arbor: diameter 2.9 mm., snailed.
Train: Gilded brass wheels, the going train wheels with five crossings except for the escape wheel which has four. A high quality train.
Jewelling: at the following points: bottom centre, third, fourth, escape, pallets, balance, bottom repeating barrel, 3rd, 4th, 5th mobiles of the repeating train, pallet pivots of the repeating train escapement. The going train escapement with endstones. The centre, third and fourth jewel holes at the back are bombé.
Escapement: Club tooth lever; straight line layout, short lever, double roller, impulse pin triangular. Pallet stones exposed, the acting faces flat. Pallet frame with poising extensions, the dart and the poising tail screwed to the pallet frame.
Escape wheel of steel, the teeth chamfered from both sides and the wheel recessed.
A mixed escapement.
Number of teeth embraced 3½.
Balance: Split bimetallic balance with gold compensation screws; balance diameter 9.3 mm., thickness 0.9 mm. Blued-steel flat spiral spring with 16¼ turns and with a terminal curve. A radially adjustable stud beneath a clamped cover.
Means of Regulation: Index on the balance cock with a divided scale with engraved 'AVANCE RETARD'.
Train Counts and Beat Rate:
Great Wheel (barrel) 76
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 6
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: the most sophisticated of the repeating mechanisms as evidenced by the fact that the quarter jumper is controlled by an "isolator". (2)
Dimensions: Movement diameter 27.3 mm., height 8.00 mm.
Provenance: Formerly in the Ilbert collection. Ilbert purchased this from Bentley in March 1937.
(1) This watch probably made by Le Coultre.
(2) The 'isolator' invented by L.E. Piguet of Le Brassus.
- 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.1237 (Ilbert Collection)
Previous owner/ex-collection number: P159 (Ilbert Ledger)