- Museum number
CHROME-PLATED CASED LEVER WATCH.
Keyless watch, manual hand-set button.
Pin-pallet lever escapement.
Diameter: 51.40 millimetres (case)
Diameter: 30.60 millimetres (dial aperture)
Thickness: 22 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Theil
Germany, c. 1890
Watch with a pin pallet lever escapement.
Signature: On the inner case back is stamped 'THEIL'S WATCH GERMANY' and in an oval cartouche 'D 21006'
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 this passes the three screws which secure the movement to the case. This inner back also acts as the barrel cover.
Dial and Hands: The dial and hands missing.
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 a wedge secures the back plate to each tongue. 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 1/4 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: The motion work is missing but would have been: 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 (missing) meshing directly with the teeth on the barrel bottom. The handsetting is by a friction wheel (also missing) 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 51.2 mm., height 22.0 mm.
Movement diameter 46.2 mm.
Provenance: Formerly in the Ilbert collection.
Note: For details of Theil and this type of movement see Cutmore 1991 pp 33, 34, 35, and 88.
- Not on display
Latest: 3 (2017)
2 (Jan 1997)
2 (1994) Very dirty
- Acquisition date
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.1103 (Ilbert Collection)