- Museum number
GOLD-PLATED CASED CENTRE-SECONDS DAY-DATE AUTOMATIC CLUB-TOOTH LEVER WRIST-WATCH.
Movement with automatic winding and club-tooth lever escapement.
Silver-coloured metal dial with outer circle for minutes numbered 5-55 on black squares with triangle at 60; to right an aperture for the day and date.
Gilt-metal hands, the hour and minute with a black stripe, the centre-seconds plain.
Gold-plated case with screw-on stainless-steel back; recessed push-piece in the case-band sets the date.
Wrist-strap/bracelet now missing.
- Production date
Diameter: 31.70 millimetres (dial)
Length: 41.70 millimetres
Thickness: 13.90 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Slava
Russia (USSR), c. 1970
A self-winding wrist watch with twin barrels and day-date and with a club tooth lever escapement.
Signature: On the dial "SLAVA, 27 Jewels MADE IN USSR" On the self-winding weight 2427.
Case: A tonneau shaped two part case with a stainless steel back retained by a threaded ring and numbered 224882. The front base metal, gold plated and with a ray finish around the glass.
Dial & Hands: A brushed silvered dial with dots for the hour markings and the minutes (or seconds) numbered every five with an arrow head at the 12 o'clock position. The date dial numbered in black, the days in English in black except for "SUN" which is in red. The gilt hands of pierced baton design filled black.
Ebauche Marks: On the front plate the Slava trade mark resembling an M overlaid by a 2.
Frame: The nickel plated movement sits on an extension ring to which the dial is fixed. This ring carries some of the calendar mechanism, namely the date corrector. The movement has four bridges, one for the barrel and winding work, one for part of the train, one for the pallets and one for the centre arbor and part of the train. There is a cock for the balance.
The Twin Barrels and Mainsprings: Recessed covers to both of the going barrels which drive a single pinion. The barrels are identical except for the direction of wind of the spring in the barrel.
Barrels: I diameters 7.3 mm., height 1.5 mm.
Mainsprings: height 1.5 mm., thickness 0.08 mm.
Barrel Arbors: diameters 1.85 mm., snailed.
Hookings: Slipping attachments to the springs.
Train: The wheels are not gilded, the centre, third and fourth wheels with six crossings.
Jewelling: Jewelled bearings throughout the train. Shock resistant jewelling to the balance.
Escapement: An obtuse angle layout, club tooth lever escapement with short lever, double roller of beryllium copper and D-shaped impulse pin. A flat pallet frame, 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 balance three arm balance with a plain rim. Balance diameter 10.5 mm., thickness 0.56 mm. A 'self compensating' flat spiral spring with 13 turns cemented into both the stud and the collet.
Means of Regulation: An index on the balance cock registers against a centre mark and with + and -. Beat setting is provided.
Train Counts and Beat Rate:
Great wheels 68 (barrels)
Intermediate pinion 18. This carries the wheel of 50 which drives the second pinion. The intermediate pinion also drives a wheel of 60 whose arbor carries the minute hand.
Second wheel 60 pinion 10
Third wheel 70 pinion 10
Fourth wheel 86 pinion 7
Escape wheel 15 pinion 8
Beat rate 18,000
Motion work: cannon pinion 12
minute wheel 32, minute pinion 8
hour wheel 36 with mounted on it a wheel of 21.
Calendar wheel 42.
Self winding work: Is of the geared type.
Winding System: Conventional positive stem set keyless work.
Dimensions: Case diameter 37.0 mm., height 13.8 mm.
Movement diameter 32.0 mm., height 8.7 mm.
Provenance: Purchased in 1989.
- Not on display
Latest: 5 (2017) rust on hour hand, movement ok
5 (Jul 1995)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number