- Museum number
SILVER-CASED LEVER WATCH WITH CALENDAR AND LUNAR INDICATIONS.
Bar movement; going-barrel.
Club-tooth lever escapement; keyless winding and hand-set.
Enamel dial; subsidiaries for date, day of the week, month, seconds; aperture for age and phase of moon.
Pierced gold hour and minute hands; gold seconds hand and date indicators.
Nickel open-faced case; glass cover to movement; back engraved with foliage and hound holding bird.
- Production date
Diameter: 64.20 millimetres (case)
Diameter: 54.20 millimetres (dial)
Thickness: 21.90 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1920
Silver cased calendar watch with a club tooth lever escapement.
Case: Heavy silver open face case with double back and a glazed bezel to protect the movement when viewing. The case numbered in both backs 46202. The outside of the back is engraved with flowers and a retriever with a game bird. There is an engine turned border to the outer side of the inner back. Within this border is inscribed 'ANCRE LIGNE DROITE REMONTOIR, QUANTIEMES'(1) in a scroll, 'SPIRAL BREGUET QUINZE rubis PHASES LUNAIRES'. No quality marks. 4 push buttons can be operated within opening the bezel for setting the calendar etc.
Dial and Hands: The numerals in blue. The minutes numbered at every 5. Four subsidiary dials; at 12 o'clock the months at 3, the days at 6, the seconds dial with beneath it the phases of the moon, at 9 the date. The hands are all of gold, the minute and hour hand of Louis XVI pattern. Scratched on the back of the dial is 203. The days and months in Spanish.
Ebauche Marks: 46202 40 4
Frame: Nickel silver frame, bar movement. Stamped under the balance, pallet and escape wheel cocks is 4. Under the barrel bridge is stamped 40.
Barrel and Mainspring: Recessed cover to the going barrel.
Barrel I. diameter 19.8 mm, height 2.8 mm.
Mainspring: height 2.8mm, thickness 0.25 mm.
Arbor diameter 6.1 mm., snailed.
Train: With wheels glided one side and with five crossings except for the escape which has four.
Jewelled: From the third onwards, the stones rubbed in, ruby endstones to the balance pivots.
Escapement: Club tooth lever, straight line, short lever, single roller, impulse pin of elliptical section. Escape wheel steel with chamfered teeth. Pallets with enclosed stones, the impulse and locking faces convex.
An equal impulse escapement.
Number of teeth embraced 3½.
Balance and Spring: A bimetallic balance but inoperative since it is not split. Balance diameter 20.05 mm, thickness 1.1 mm. Blued-steel flat spiral spring of 11 turns.
Means of Regulation: Index on the balance cock registering against a divided scale with engraved 'R A'
Train Counts and Beat Rate:
Great wheel (barrel) 84.
Centre wheel 80 pinion 12
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 10, minute wheel 30
minute pinion 8, hour wheel 32,
Calendar driving wheel 26 (mounted on the hour wheel.)
Moon wheel (triangular teeth) 59
Day " " " 7 (Jumper spring broken)
Date " " " 31
Month " " " 12 this wheel can only be indexed manually
Date indexing wheel 52
Day " " 52 (indexing pin missing)
Winding System: Normal side set positive keyless work.
Dimensions: Case diameter 64.2 mm. height over glass 20-7 mm.
Movement diameter 54.5 mm, height 14.0 mm.
Provenance: Formerly in the Ilbert collection. Purchased at Sothebys for Ilbert by Percy Webster 17/2/1931.
(1) 'QUANTIEMES' would seem to indicate that this is perpetual calendar watch whereas in fact the month wheel has to be indexed manually.
- Not on display
- Latest: 3 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.0963 (Ilbert Collection)
Previous owner/ex-collection number: K72 (Ilbert Ledger)