- Museum number
STAINLESS STEEL CASED BLACK-DIALLED CENTRE-SECONDS CLUB-TOOTH LEVER WRIST-CHRONOGRAPH WITH LUMINOUS HANDS AND HOUR-MARKS AND STAINLESS STEEL BRACELET.
Movement with club-tooth lever escapement and centre-seconds chronograph, the stop, start and fly-back functions operated by two push-buttons in the case-band.
Black-painted metal dial with a tachymeter around the outside; baton hour markers with luminous dots surrounding a telemeter dial; to left and right, subsidiary dials for seconds and chronograph minutes.
Stainless-steel hands, the hour and minute with luminous painted bar; centre-seconds chronograph hand with red-painted disc.
Stainless-steel case with snap-on back.
- Production date
Diameter: 36 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by SECONDA
Russia (USSR), c. 1960
Wrist Watch with chronograph work and club tooth lever escapement.
Signature: On the dial 'SEKONDA 19 Jewels MADE IN U.S.S.R.'
Case: A chrome plated case with a snap on bezel and back. There are two push pieces for operating the chronograph work. With the watch is a stainless steel strap marked '100% STAINLESS STEEL' on the buckle and with six links that can be removed for adjusting the length. These links are stamped 'U.K. PAT' and a number 1418802 . Also each has a slot with marked by its side 'OPEN' with an arrow and 'CLOSE' also with an arrow.
Dial & Hands: A black dial with batons for the hours with a broader baton at the 12 o'clock. The centre of the batons are filled white and there are luminous marks also at the hours. A white minute circle with 1/5th seconds marks and marked 'TACKYMERE' and numbered 60, 65, 70, 75, 80, 85, 90 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 240, 270 and 300.
Within the chapter ring is 'TELEMETER' with the divisions numbered 1 KM 2, 3, then a gap to avoid the sunk minute counter dial then 7, 8, 9, 10, 11, 12, 13 with another gap to avoid the sunk subsidiary seconds dial, then 17, 18 and 19. The minute counter is numbered 15, 30 and 45. The seconds dial 20, 40 and 60 The minute and hour hands with skeletonised tips filled luminous, with the extreme tips painted red. The centre seconds hand with a red dot near its tip.
Ebauche Marks: On the balance cock the number 72712, on the pallet cock is the number 3017 and by the side of the cock on the inside of the front plate is the trade mark like a trident with a very short handle.
Frame: On the cock for the chronograph wheels is '19 JEWELS'.
A barrel, keyless work and train bridge, a cock for the fourth and escape wheels. Cocks for the pallets and balance.
Barrel and Mainspring: A recessed cover to the going barrel.
Barrel: I diameter 12.5 mm., height 1.6 mm.
Mainspring: height 1.6 mm., thickness 0.13 mm.
Barrel Arbor: diameter 3.6 mm, snailed.
Hooking: The spring has a brace which is furnished with ears which penetrate slots in both the cover and the barrel bottom.
Train: All the wheels 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: 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 13.04 mm., thickness 0.74 mm. A 'self compensating' flat spiral spring with 13 1/3 turns.
Means of Regulation: An index on the balance cock registers against a divided scale with '+' and '-' stamped on the balance cock table.
Train Counts and Beat Rate:
Great wheel 112 (barrel)
Centre wheel 80 pinion 16
Third wheel 60 pinion 10
Fourth wheel 60 pinion 8. Mounted on the extended pivot of the fourth wheel is a fine triangular toothed wheel which when required is put into mesh with the fine toothed centre seconds wheel.
Escape wheel 15 pinion 6
Beat rate 18,000
Motion work: cannon pinion 14
minute wheel 36, minute pinion 12
hour wheel 56
Winding System: Conventional positive stem set keyless work.
Chronograph work: Operated by a castle wheel of conventional design.
Case: Diameter 36.1 mm., height 12 mm., over the glass.
Movement: diameter 32.3 mm., over the dial movement 30.0 mm., height 8.0 mm.
Provenance: Purchased in 1989 with the aid of funds from the Dingwall Bequest.
- Not on display
- Acquisition date
- Britain, Europe and Prehistory
- Registration number