- Museum number
Lever escapement; Keyless, `snail' regulator.
9ct gold half-hunter case.
- Production date
Diameter: 49.40 millimetres (case)
Diameter: 40.90 millimetres (dial)
Diameter: 17 millimetres (half-hunter aperture)
Thickness: 14.30 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Dimier Freres & Co
Geneva, Switzerland, c. 1919
Gold cased watch with club tooth lever escapement
Signature: On the train bridge "SELEZI", on the barrel bridge "SWISS MADE" and "DF&C" in a lozenge.
Case: Half hunter 9 ct. gold case with the import mark for London and the date mark for 1919. Also the case makers mark DBS, the number 817117 and a star. These marks are repeated in the front cover and the inner back cover with the exception of the date mark. The pendant also with the 9 ct gold mark.
Dial and Hands: Flat dial with sunk subsidiary seconds dial. The hands of blued-steel, the hour a double swell spade.
Dust-cap: An edge ring surrounds the movement.
Ebauche Marks: 959
Frame: A combined barrel and centre bridge, a train bridge, a pallet cock and a balance cock. All the parts stamped 959.
Barrel and Mainspring:
Going Barrel: I diameter 16.6 mm., height 2.3 mm
Mainspring: height 2.1 mm thickness 0.21 mm
Arbor: diameter 5.3 mm., snailed
Hooking: A pressed in tongue
Train: The train wheels gilded with five crossings. The steel escape wheel has four crossings.
Jewelled: from the third onwards, the jewels in the train bridge in screwed settings, all the other jewels rubbed in. Ruby endstones for the balance jewels.
Escapement: Club tooth lever, straight line layout, short lever, double roller, impulse pin, D shaped. Pallet stones exposed the acting faces flat. Escape wheel of steel, the teeth chamfered.
The pallet staff screwed in.
An equidistant locking escapement.
Number of teeth embraced 3½
Balance and Spring: A split bimetallic balance with brass compensation and quarter screws. Balance diam 16.6 mm., thickness 1.1 mm. Blued-steel flat spiral spring with 17 turns and terminal curve.
Means of Regulation: Micrometer controlled index on the balance cock with a divided cam, a whiplash spring and engraved "A R" and "F S"
Train Counts and Beat Rate:
Great Wheel (barrel) 90
Centre wheel 75 pinion 15
Third wheel 80 pinion 10
Fourth wheel 80 pinion 10
Escape wheel 15 pinion 8
Beat rate 18,000
Motion work: cannon pinion 14
Minute wheel 32, minute pinion 8
hour wheel 42
Winding System: Positive set keyless work of conventional design
Dimensions: Case diameter 49.4 mm., height 14.2 mm
Movement: diameter 40.0 mm., height 8.0 mm.
Provenance: Bequeathed by F.R.S. Rogers Esq. in 1972.
- Not on display
- Latest: 2 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number