- Museum number
NICKEL-PLATE BRASS CASED LEVER WATCH.
Pin lever escapement; Roskopf pattern; keyless.
Painted metal dial.
Blued-steel hands. Engine-turned nickel-plated brass case.
Diameter: 53.70 millimetres (case)
Diameter: 48.10 millimetres (dial)
Thickness: 18.40 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1920
A keyless wound pocket watch with a pin pallet lever escapement.
Signature: On the dial 'RAILWAY TIMEKEEPER NICOBAR LEVER SWISS MADE'. On the movement back plate also 'SWISS MADE'
Case: An open face, nickel plated case with a plain inner back and an engine turned outer back with a ribbon and shield at its centre. The movement is retained in the case by two dog screws one of which is broken.
Dial and Hands: A silvered dial with raised gilt Roman numerals The minute marks are stamped dots and around these is a border of stamped scrolling foliage. At the dial centre is stamped representations of grapes and a floral pattern.
The dial is secured by screws, one at IX o'clock and one at III o'clock. The spade hands are of blued-steel.
Movement: Ebauche marks: none.
Frame: The brass movement is not numbered and is of ¾ plate layout. Cocks for the lever and balance, both mounted on the back plate which is supported by four pillars and secured by screws. A bridge covers the winding wheel, the barrel ratchet wheel and the click.
Barrel and Mainspring. A large going barrel of the Roskopf type with the minute wheel mounted friction tight on the steel cover.
Barrel internal diameter 23.8 mm., height 2.2 mm.
Mainspring height 2.8 mm., thickness 0.25 mm.
Arbor: diameter 5.5 mm., snailed.
Hooking: The mainspring is hooked to a strengthened turn of mainspring which can locate in one of four notches in the barrel wall, thus providing a slipping facility.
Train: Brass wheels with five crossings except for the escape wheel which has four.
Jewels: No jewels.
Escapement: A pin pallet lever escapement with an obtuse angle layout. A long lever a brass, effectively a double roller. A brass impulse finger. A nickel silver lever with the steel pins set at the ends of long flexible arms for ease of adjustment. An equal impulse escapement.
Number of teeth embraced 3 ½.
Balance and Spring: A plain brass three arm balance with a rounded rim. Balance diameter 15.9 mm., thickness 0.75 mm. A flat spiral blued-steel spring of 11 ½ turns.
Means of Regulation: An index on the balance cock registering against a divided scale with engraved 'A R' and 'F S'.
Train Counts and Beat Rate:
Great wheel (barrel) 140 (rotates once in 4 hours)
Second wheel 84 pinion 7 rotates once in 12 minutes
Third wheel 48 pinion 7 rotates once in one minute.
Escape wheel 18 pinion 6 rotates once in 5 seconds
Beat Rate 17,280
Motion Work: cannon pinion 18, minute wheel 72, minute pinion 22, hour wheel 66
Winding System: Side set positive keyless work.
Dimensions: Case diameter 53.4 mm., height over the glass 18.1 mm. Movement diameter 47.3 mm., 11.2 mm., in height.
Provenance: Formerly in the Ilbert collection.
- Not on display
Latest: 4 (2017)
4 (1994) Dirty.
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.0961 (Ilbert Collection)
Previous owner/ex-collection number: L140 (Ilbert Ledger)