- Museum number
CHROME-PLATED CASED LEVER WATCH.
Pin-pallet lever escapement; manual hand-set button; keyless.
Paper dial; hours I-XII; minutes 5-60; subsidiary seconds.
Blued steel spade hands.
- Production date
Diameter: 50.20 millimetres (case)
Diameter: 38.90 millimetres (dial)
Thickness: 22.30 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
ANONYMOUS (but by Theil)
Germany, c. 1880
Watch with a pin pallet lever escapement.
Signature: On the inner case back is stamped 'MADE IN GERMANY'.
Case: A chrome plated case with a hinged back and a snap on bezel. An inner back which is one with the band and through which pass the three screws which secure the movement to the case, this back is numbered D95021. This inner back also acts as the barrel cover.
Dial and Hands: A printed dial with black Roman numerals and minute marks. The minutes are numbered at every five except for 30 where the subsidiary seconds dial is situated. The dial is of card and there is, astonishingly, no means of securing or locating it. The hands of blued steel, with the hour and minute of spade design.
Ebauche Marks: none.
Frame: The centre wheel is keyed into the barrel arbor and is thus driven direct. The construction is full plate with the back plate supported by two plate type pillars which are bent up from the bottom plate. Each has two tongues which pass through the top plate and are pinned to retain the plate. One has a second small plate which traps the keyless winding wheel. The click and click spring combined is also between the plates with at its end a tongue that is bent up and passes through a gap in the back plate and into the teeth of the barrel ratchet.
Barrel and Mainspring: Barrel effective inside diameter 33.2 mm. The spring actually is restrained by 8 nibs which are bent up from the winding wheel which also serves as the barrel bottom.
Mainspring height 2.70 mm., thickness 0.20 mm.
Going Arbor: Diameter 7.8 mm., not snailed
Hooking: The end of the spring is bent around one of the nibs.
Train: The brass wheels with five crossings, escape wheel with four.
Jewelled: No jewels.
Escapement: A pin pallet escapement with an obtuse angle layout and a long lever. Cylindrical steel impulse pin and steel pallet pins.
An equal impulse escapement.
Number of teeth embraced 3 ½.
Balance and Spring: A brass three arm balance diameter 17.1 mm., thickness 0.67 mm.
The flat spiral blued steel spring with 6 ¼ turns.
Means of Regulation: An index on the back plate which passes through the inner cover of the case which is stamped with 'FAST SLOW'.
Train Counts and Beat Rate:
Centre wheel 72
Third wheel 60 pinion 9
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 6
Beat Rate 2,400
Motion Work: Cannon pinion 10, minute wheel 30, minute pinion 9, hour wheel 36.
Winding system: The mainspring is wound from the pendant with a winding wheel meshing directly with the teeth on the barrel bottom. The handsetting is by a friction wheel mounted directly on the slipping arbor that passes through the barrel arbor and the centre wheel and that carries the cannon pinion.
Dimensions: Case diameter 49.4 mm., height 22.2 mm.
Movement diameter mm., height mm.
Provenance: Formerly in the Ilbert collection. Ilbert obtained this from Malcolm Gardner in 1952.
For details of Theil and this type of movement see Cutmore 1991 pp 33, 34, 35, and 88.
This watch has the astonishingly few components, 48 in total, a triumph of design!
- Not on display
- Latest: 3 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1102 (Ilbert Collection)
Previous owner/ex-collection number: Q212 (Ilbert Ledger)