- Museum number
Rectangular-dialled eight-day jewelled lever wrist-watch with subsidiary-seconds in a nickel-chromium case.
Eight-day duration movement with club-tooth lever escapement.
Silvered dial with Arabic hour numerals and subsidiary seconds.
Nickel-chromium-plated case with hinged back.
- Production date
Length: 25.30 millimetres (dial)
Length: 39 millimetres
Thickness: 10.20 millimetres
Width: 20.40 millimetres (dial)
Width: 26 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1930
8 Day wrist watch with twin barrels and a club tooth lever escapement
Signature: None but on the dial is '8 DAYS' and on the movement train bridge 'SWISS MADE 15 JEWELS'.
Case: Chrome plated two piece case of tonneau design marked in the back 'NICKEL CHROME', numbered 0520647 X.
Dial & Hands: A silvered dial with a subsidiary seconds dial. Scratched on the back of the dial "169" twice, "6H 62949", and "Huber Berlin".
Blued-steel hands of pyramid design.
Ebauche Marks: 'MA' as a monogram in a triangle(1) with underneath 50.
Frame: A nickel silver frame with a bridge for the barrels, one for the train and cocks for the escape wheel, pallets and balance.
Barrels and Mainsprings:
Barrel 1: This does not mesh with the train but serves to wind the second barrel through an intermediate pinion thus increasing the length of run. Both of these going barrels have recessed covers and both have hookings milled from the barrel wall.
Barrel 1: I diameter 10 mm., height 1.8 mm.
Mainspring: height 1.8 mm., thickness 0.13 mm.
Barrel Arbor: diameter 3.25 mm., snailed.
Barrel 2: I diameter 9.75 mm., height 1.45 mm.
Mainspring: height 1.45 mm., thickness 0.11 mm.
Barrel Arbor: diameter 3.20 mm., snailed.
Train: All the brass wheels are gilded, the intermediate centre, third and fourth wheels with five crossings, the steel escape wheel has four crossings.
Jewelling: Jewelled bearings from the third wheel onwards, all the jewels rubbed in. The balance with ruby endstones.
Escapement: A straight line 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.
A mixed escapement.
No. of teeth embraced 3½.
Balance & Spring: a split bimetallic balance with brass screws. Balance diameter 7.3 mm., thickness 0.55 mm. A blued-steel flat spiral spring with 12 turns.
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 72 (barrel)
Intermediate wheel 50 pinion 14
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 10
minute wheel 30, minute pinion 8
hour wheel 32
Winding System: Conventional positive stem set keyless work
Dimensions: Case length 32.0 mm., width 25.7 mm., height 10.2 mm over the glass.
Movement length 29.2 mm., width 23.5 mm., height 6.70 mm.
Provenance: Purchased in 1989 with the aid of funds from the Dingwall Bequest.
(1) A MICHEL of NEUENBURG.
- Not on display
- Exhibition history
1991, London, The British Museum, Collecting the Twentieth Century
Latest: 4 (Sep 2017)
4 (Mar 1996)
4 (Jul 1995)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number