- Museum number
GILT-BRASS CASED LEVER WATCH WITH ALARM MECHANISM [CASE NOT ORIGINAL].
Skeletonised back-plate with separate cocks for the fourth-wheel and escapement.
Balance under dial.
Enamel dial; subsidiary for alarm-setting; minutes 1-30; winds through dial.
Blued-steel hands not original.
Gilt-brass case; glazed front and back, not original.
- Production date
Diameter: 55.80 millimetres (case)
Diameter: 47.90 millimetres (dial)
Thickness: 21 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Charles Oudin
Paris, c. 1820.
Pocket watch with date and alarm and a club tooth lever escapement.
Signature: On the dial 'Oudin'(1)
Case: A replacement open face brass case, with a hinged bezel (the glass missing) and a glazed hinged back. The pendant stamped 'A * L' in relief, in a diamond shaped depression .(2)
Dial & Hands:
The enamel dial is badly damaged with hairline cracks and portions missing between 5 and 6 o'clock, at 3 o'clock and at 9 o'clock. Black Arabic hour numerals and date numbers, the latter with stars between each of the numbers which are from 1 - 30. An alarm setting dial above 6 o'clock with the numerals 12, 3 and 9, the 6 serves the dual purpose of the hour and the alarm setting numerals. Two winding holes are pierced through the dial. On the back of the dial, fired into the counter-enamel, in black, is 'Lucard' Moon hands and a simple baton alarm hand, all in blued steel. The date hand missing.
Ebauche Marks: None.
Frame: A gilded brass frame, the back plate supported by four plain turned pillars and secured by screws. The back plate is pierced out to reveal the train and escapement. There are bridges for both the going and the alarm barrels and a cock for the fourth wheel. The balance is mounted on the front plate beneath the dial and is supported by a cock with a potence on the inside of the front plate. This potence is steel and also supports the bottom pivot of the pallets. A steel cock on the front plate supports the escape wheel bottom pivot. All of the escapement holes are furnished with coquerettes.
Barrel and Mainspring: A going barrel with the teeth part way up the wall. Geneva four turn stop work.
Barrel: internal diameter 17.7 mm., height 3.56 mm.
Mainspring: height 3.36 mm., thickness 0.19 mm.
Barrel Arbor: diameter 5.8 mm., snailed.
Hooking: A round hook with the spring kept against the barrel wall by a T piece which is let into both the cover and the barrel bottom.
Train: The brass wheels are not gilded, the centre, third and fourth wheels with four crossings. The escape wheel also has four crossings.
Jewelling: No jewels.
Escapement: An obtuse angle layout, club tooth lever escapement with short lever, effectively a double roller and steel wedge shaped impulse arm. The exposed pallet stones have flat acting faces. A brass escape wheel with oil slots across the teeth in the same plane as the wheel. The steel pallets are slightly convex along their length. The impulse finger and the small roller have been machined from the solid staff. Impulse is given via two steel pins on the lever. These pins are 0.14 mm. in diameter. Soldered to the end of the lever where it may act with the small roller is a gold tip to reduce any friction between the two. There is no draw. The body of the pallets bank on brass pins. Banking is on pins.
An equal impulse escapement.
No. of teeth embraced 3½.
Balance & Spring: A three armed brass balance with a plain rim. Balance diameter 15.9 mm, thickness 1.0 mm. A blued-steel flat spiral spring with 6 1/4 turns.
Means of Regulation: An index on the front plate beneath the dial carries a pin on its end which engages with a slotted piece on a slide. This slide is mounted on the adaptor to which the movement is fixed by three screws. In the original case this slide was no doubt accessible from the front of the watch.
Train Counts and Beat Rate:
Great wheel 60 (barrel)
Intermediate wheel 36 pinion 12
Centre wheel 64 pinion 18
Third wheel 60 pinion 8
Fourth wheel 60 pinion 8
Escape wheel 18 pinion 8
This gives a length of run of 50 hours.
Beat rate: 16,200
Motion work: cannon pinion 10
minute wheel 30, minute pinion 8
hour wheel 32 with a wheel of 15 mounted beneath it to drive the date indexing wheel which has 30 teeth.
Date Work: A star wheel runs on the hour wheel pipe and has 30 ratchet teeth. It is positioned by a steel jumper spring.
Alarm Work: The alarm hand is mounted on the pipe of a steel disc which has a slit which when aligned with a stop lever allows this to rise and release the alarm train. The train is as follows:
Alarm Barrel and Spring: A fixed barrel and a going arbor. The internal diameter of the barrel 12.9 mm., height 3.40 mm.
Mainspring height 3.2 mm., thickness 0.14 mm.
Arbor 4.3 mm., not snailed.
Hooking: A round hook.
Main wheel 52
Second wheel 52 pinion 8.
A tic-tac escapement with the escape wheel 24 pinion 8, a pin on the escape wheel stops the train from revolving when the stop lever is engaged.
Winding System: Keywound.
Case: Diameter 55.6 mm., height 17.5 mm., over one glass, the other glass is missing.
Movement: diameter 51 mm., height 14.5 mm.
Provenance: Formerly in the Ilbert collection.
(1) Active c. 1807 - 1825
(2) The mark of CHARLES-AUGUSTE LINZELER known to be working in Paris in 1820.
- Not on display
Latest: 3 (2017)
4 (1994) Case very dirty. glass broken
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1119 (Ilbert Collection)
Previous owner/ex-collection number: Q7 (Ilbert Ledger)