- Museum number
STAINLESS-STEEL CASED CLUB-TOOTH LEVER WRIST-WATCH WITH BLACK DIAL AND BLACK LEATHER WRIST-STRAP.
Movement with gilded brass plates and right-angle club-tooth lever escapement.
Black painted metal dial with gold minute ring and gold Arabic hour numerals with subsidiary seconds.
Hour, minute and centre-seconds hands.
Rectangular stainless-steel case with snap-on back.
Black leather wrist-strap.
- Production date
Length: 31 millimetres
Width: 20 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Besançon, France, c. 1950
Wrist watch with a club tooth lever escapement.
Signature: On the dial 'LIP'.
Case: A rectangular case of stainless steel numbered on the outside of the back 212942. Stamped inside 'LIP 182733' all in a cartouche and beneath 'FABRICATION FRANÇAISE'.
Dial & Hands: A black dial with numerals and other markings in gold. A small rectangular seconds dial. The dial secured with two screws. Luminous dots at 12, 3, 6, and 9. Gilt hands of "modern design' with luminous painted tips.
Ebauche Marks. Under the barrel bridge is the number 187780.
Frame: A gilded brass frame tonneau shaped with a bridge for the barrel, another for the train. A cock for the balance and one for the pallets the latter in nickel silver.
Barrel and Mainspring: A recessed cover to the going barrel.
Barrel: I diameter 10.4 mm., height 1.25 mm.
Mainspring: height 1.25 mm., thickness 0.12 mm.
Barrel Arbor: diameter 3.4 mm., snailed.
Hooking: milled from the barrel wall.
Train: All the brass wheels are gilded, the centre wheel, third and fourth wheels with five crossings. The steel escape wheel with four.
Jewelling: Jewelled bearings from the third wheel onwards, all the jewels pressed in. Ruby endstones to the balance jewels.
Escapement: An obtuse angle layout club tooth lever escapement with short lever, double roller and D-shaped impulse pin. The exposed pallet stones have flat acting faces. A steel escape wheel with four crossings.
An equidistant locking escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic nickel balance with brass screws. Balance diameter 10.25 mm., thickness 0.7 mm. A 'self compensating' flat spiral spring with 15 ½ turns and a terminal curve.
Means of Regulation: An index on the balance cock registers against a divided scale with 'F S' and 'A R' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 71 (barrel)
Centre wheel 64 pinion 12
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 32, minute pinion 8
hour wheel 36
Keyless work: Conventional positive stem set keyless work.
Dimensions: Case length 31.0 mm., width 20.0 mm., h. 8.8 mm over the glass.
Movement: length 28.3 mm., width 17.7 mm., height 6.3 mm.
Provenance: Donated in 1983 by The Heron Corporation Ltd.
- Not on display
- Acquisition date
- Britain, Europe and Prehistory
- Registration number