- Museum number
GILT-METAL CASED PIN-PALLET LEVER WRIST-WATCH.
Distressed movement, originally with pin-pallet lever escapement.
Metallic-blue painted dial with two apertures through which can be seen the rotating discs on which are inscribed the Arabic hours and minutes.
Rectangular gilded-metal case with snap-on stainless-steel back.
Length: 39.40 millimetres
Thickness: 11.30 millimetres
Width: 37.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1975
Digital wrist watch with a movement that has a pin pallet escapement.
Signature: On the dial 'SIMBA SWISS 17 JEWELS'.
Case: A rectangular two piece case with curved sides these with a polished bevel and the front brushed, this part gilt. the case back is marked 'BASE METAL BEZEL STAINLESS STEEL BACK U.S. PATENT 3685283 OTHER PATENTS PENDING'.
The recess in the case back for the mechanism is offset. The spring bars are missing.
Dial & Hands: A rectangular dial brush finished steel blue with the raised edges of the aperture outlined gilt. This aperture accommodates the square for the hour and the segment for the minutes.
The dial is spaced off from the front plate by the heads of four screws two of which are threaded to take the screws that secure the dial, one at the top and the other at the bottom. In the space are two circular discs which show through apertures, the hour disc on the left hand side in black with the hours 1 - 12 in Arabic numerals in white and the black minute disc on the right with 00, 05, 10, 15, 20, 25, 30, 35, 40, 45, 50, and 55 in white.
Ebauche Marks: A 420 (Amida) but modified to display
Frame: A round movement of nickel silver with the barrel and train bridge missing. The pallet and balance cocks survive.
Barrel and Mainspring: missing.
Train: All the wheels missing. The steel escape wheel survives and has four crossings.
Jewelling: Jewelled bearings from the second wheel onwards, but the train bridge is missing. All the jewels pressed in. Ruby endstones to the balance jewels.
Escapement: A straight line layout, pin pallet lever escapement with short lever, double roller and D-shaped impulse pin. The pallet pins of steel. A steel escape wheel with four crossings.
An equal impulse escapement.
No. of teeth embraced 3½.
Balance & Spring: A monometallic balance with a plain rim. Balance diameter 10.0 mm, thickness 0.40 mm. A 'self compensating' flat spiral spring with 9 ½ turns. One of the pivots is broken.
Means of Regulation: An index on the balance cock is tailless there are no divided scale or markings.
Train Counts and Beat Rate:
Escape wheel 15 pinion 6
Beat rate: 18,000
Digital Drive: The drive to the two discs is from the barrel and through gearing to one of the discs, the minute, and through a finger which indexes an idle ratchet wheel which in turn drives a ratchet wheel mounted directly on the back of the hour disc.
The gearing is as follows:-
Pinion carrying the finger which indexes the ratchet wheels 12.
Wheel driving the minute disc 40, this wheel is loosely mounted on the minute pinion.
Pinion on back of the minute disc 15
Minute pinion 8
Minute wheel 32, three teeth broken off.
Second minute wheel 32 (this wheel is driven by the teeth on the barrel)
Winding System: Normal positive keyless work.
Case: 39.2 mm., in length 28.2 mm., wide without the lugs and 10.5 mm. in height over the glass.
Movement: diameter 26.1 mm, across the flats 23.3 mm., cannot be determined.
Provenance: Donated by the Heron corporation in 1983.
- Not on display
- Latest: 4 (May 1995) Watch had been stored in radium store in past. Checked with meter by RPA Simon Wright 14/09/2017 and confirmed definitely no radium.
- Acquisition date
- Britain, Europe and Prehistory
- Registration number