- Museum number
Stainless-steel cased club-tooth lever centre-seconds wrist-watch with twin-barrelled movement and black leather strap.
Movement with twin going barrels and club-tooth lever escapement.
Silvered-metal dial with baton hour markers.
Stainless-steel hour, minute and centre-seconds hands.
Stainless-steel case with screw-on back.
Black leather wrist-strap with gold-plated buckle.
- Production date
Diameter: 34.40 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Favre-Leuba
Wrist watch with twin barrels and a club tooth lever escapement.
Signature: On the dial 'FAVRE-LEUBA GENEVE TWIN POWER'. On the barrel bridge 'FAVRE-LEUBA WATERPROOF SWISS MADE'.
Case: A stainless steel case, on the screw back is 'FAVRE-LEUBA WATERPROOF SWISS MADE STEEL WATERPROOF'.
Dial & Hands: Brush silvered dial with rhodium plated batons and baton hands, the centre seconds hand with a tail. The hour and minute hands although slim are skeletonised and filled with luminous paint.
Ebauche Marks FL<253
Frame: A gilt plated movement with a barrel bridge and a train bridge. Also pallet and balance bridges although these have a screw at one end only.
Barrels and Mainsprings: Two identical barrels. The steel winding wheels which are integral with the arbors also act as barrel covers.
Barrels: I diameters 7.0 mm., heights 1.40 mm.
Mainsprings: heights 1.40 mm., thicknesses 0.065 mm.
Barrel Arbors: diameters 1.8 mm., snailed.
Hooking: Milled from the barrel walls.
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, with additionally bottom jewels for the centre and the two barrel arbors. All the jewels pressed in. Ruby endstones to the balance jewels.
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 three arm monometallic balance. Balance diameter 10.3 mm, thickness 0.45 mm. A 'self compensating' flat spiral spring with 12 turns.
Means of Regulation: An index on the balance bridge cock and + and - are engraved on the bridge. A spring held extension to the stud for beat setting.
Train Counts and Beat Rate:
Great wheels 63 (barrels)
Intermediate wheel 27
Centre wheel 60 pinion 12
Third wheel 64 pinion 8
Fourth wheel 70 pinion 8
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 12
minute wheel 40, minute pinion 10
hour wheel 36
Winding System: Conventional positive stem set keyless work.
Case: diameter 34.3 mm., height 6.6 mm (over the glass)
Movement: diameter 29.5 mm., height 5.3 mm.
Provenance: Purchased in 1988 with the aid of funds from the Dingwall Bequest.
Literature: "A wrist watch with two mainspring barrels" by P. W. Amis, J. Clark and D.W.R Higginson HJ January 1963 pp. 13, 14 and 30.
- Not on display
- Latest: 3 (Jun 1995)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number