- Museum number
GOLD-PLATED CENTRE-SECONDS WATERPROOF JEWELLED CLUB-TOOTH LEVER WRIST-WATCH
Movement with club-tooth lever escapement.
Silver-coloured metal dial; matted pattern; Arabic hour numerals.
Gold-plated hour, minute and seconds hands.
Gold-plated case with integral bezel and screw-on stainless-steel back; bezel has hatched decoration between raised bars which mark the hours, two bars at 12 O'clock.
Winding button missing; escape-wheel pivot broken.
- Production date
Diameter: 33 millimetres (case)
Diameter: 27.80 millimetres (dial)
Length: 39.70 millimetres
Thickness: 9.70 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Poljot
Russia (USSR) c. 1960
Wrist watch with club tooth lever escapement.
Signature: On the dial 'POLJOT 16 JEWELS'. On the barrel ratchet wheel 'IM43'. On the train bridge '16 KAMHEN 9, (the N reversed and with a line above) and in a diamond shaped cartouche 1/M43
Case: A base metal case, the finish gilt. A stainless steel back with a locating lug secured by a threaded ring. On this back is 'STAINLESS STEEL BACK WATERPROTECTED ANTISHOCK FOREIGN'.
The spring bars are missing.
Dial & Hands: A domed metal dial with a linen finish, the even numbers in Arabic with batons between, all gilt. Gilt parallel baton hands. Gilt centre seconds hand.
Ebauche Marks: 0317734.
Frame: The plates are of nickel silver. A bridge for the barrel and another for the train. Cocks for the pallets and balance. A sub bridge supports the bottom bearing of the centre and fourth wheels.
Barrel and Mainspring: A recessed cover to the going barrel.
Barrel: I diameter 9.35 mm., height 1.4 mm.
Mainspring: height 1.4 mm., thickness 0.11 mm.
Barrel Arbor: diameter 2.6 mm., snailed.
Hooking: The spring is furnished with a brace on its end to keep the spring open as it unwinds.
Train: All the brass wheels gilded, the centre wheel with six crossings, the fourth wheel with five crossings. The third and escape wheel (the latter of steel) with four crossings.
Jewelling: Jewelled bearings from the centre wheel onwards, all the jewels pressed in. Shock protected bearings to the balance, the springs resembling those of the 'Incabloc' bearing.
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.
An equidistant locking escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic balance with brass screws. Balance diameter 9.90 mm., thickness 0.75 mm. A 'self compensating' flat spiral spring with 13 3/4 turns and a terminal curve.
Means of Regulation: An index on the balance cock registers against a divided scale with + and - engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 70 (barrel)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 70 pinion 8
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 12
minute wheel 32, minute pinion 8
hour wheel 36
Winding System: Conventional positive stem set keyless work.
Dimensions: Case diameter 33.0 mm., height 8.9 mm.(over the glass)
Movement diameter 23.8 mm., height 6.4 mm.
Provenance: Purchased in 1987 with the aid of funds from the Dingwall Bequest.
Bibliography: The self winding version of this calibre is described by W. G. Pike in the HJ for 1964 pp. 85 and 86.
- Not on display
Latest: 3 (2017)
3 (Jun 1995) Winding button missing, escape-wheel pivots broken.
- Acquisition date
- Britain, Europe and Prehistory
- Registration number