- Museum number
MOVEMENT AND DIAL OF A LEVER WATCH WITH CENTRE-SECONDS AND STOP LEVER.
3/4-plate; going-barrel, Geneva stopwork, rocking-bar keyless-work, hollow 2nd-pinion, ratchet-tooth lever-escapement, stop acting on roller, Earnshaw compensation balance, Breguet-overcoil.
White enamel two-piece dial; hours I-XII, sunk centre, around the outside divisions for half minutes and fifth seconds.
Gold spade hands, blued steel centre-seconds hand.
- Production date
Diameter: 41.20 millimetres (back-plate)
Diameter: 45 millimetres (dial)
Thickness: 10.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by E. Dent & Company
Movement of a ratchet tooth lever centre-seconds stop-watch.
Signature: On the dial 'DENT' in a triangle, and '61 Strand London'. (This has largely disappeared in cleaning as it was originally printed on the surface of the enamel rather than beneath the glaze). On the back plate 'DENT Watchmaker to the King. 61 Strand & 4 Royal Exchange LONDON 57535', the word Dent within a triangle.
Case: Missing, the movement was held in the case by a locating stud and two dog screws.
Dial & Hands: Flat dial with sunk centre. The minute circle is marked for half seconds with a large dot and each minute is further divided into 1/5ths for the centre seconds calibration. Inscribed '135 K' in the counter-enamel. Gold spade pattern minute and hour hands, the centre-seconds hand of blued-steel.
Dial-plate: None intended.
Dust-cap: None intended.
Ebauche Marks: 57535 S and part of an O? 16.
Frame: A 3/4 plate layout, the back plate supported by four pillars and secured by screws. Numbered 523 on the inside of the back plate. The fourth wheel is planted at the movement centre. Inscribed 'AJ 35' on the underside of the combined pallet and escape wheel cock. The balance cock foot is engraved with foliate scrolls and punched JC as a monogram and 35 on the underside.
Barrel and Mainspring:
Barrel: going barrel with five-turn Geneva stopwork and with a recessed cover; internal diameter 18.0 mm, height 2.6 mm.
Mainspring: height 2.5 mm, thickness 0.25 mm.
Barrel Arbor: diameter 6.1 mm, snailed.
Train: Polished brass wheels, the second, third and fourth wheels with five crossings. An intermediate wheel mounted under the dial on the extended second wheel arbor drives the motion-work minute wheel.
Jewelling: Jewelled bearings for the third wheel onwards. The third and fourth wheel jewels in the front plate are rubbed in, the rest in screwed settings.
Escapement: A right-angle layout ratchet tooth lever escapement with short lever, single roller and D-shaped impulse pin. The enclosed pallet stones have convex impulse and locking faces. The polished brass escape wheel has three crossings.
An equal impulse escapement.
No. of teeth embraced 32.
Balance & Spring: A split bimetallic balance with gold compensation screws and timing nuts. Balance diameter 18.4 mm, thickness 1.6 mm. A blued-steel close coiled flat spiral spring with 18 turns and a terminal curve attached to a polished steel stud screwed to the balance cock table.
Means of Regulation: An index on the balance cock registers against a divided scale with 'FAST' and 'SLOW' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 75 (barrel)
Second wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 70 pinion 8
Escape wheel 15 pinion 7
Beat rate: 18,000
Motion work: intermediate 26, cannon pinion 26
minute wheel 26, minute pinion 6
hour wheel 72.
Stop mechanism: A lever in the side of the movement causes a wire detent to touch the roller on the balance staff.
Winding System: Keyless winding with side-set rocking bar hand set mechanism.
Movement: diameter 45.0 mm, height 11.0 mm, pillar height 3.2 mm.
Provenance: Formerly in the Ilbert Collection. Ilbert purchased this in the Caledonian Road Market, London 21/4/1933.
(1) E. Dent was at this address from 1886-1921. Watches no 57502 57503 and 57504 were all purchased by the Navy in 1911. See Dent Mercer, pp. 674 and 780.
- Not on display
Latest: 2 (2017)
2 (1992) Dial signature now very faint.
- Acquisition date
- Acquisition notes
- Following the successful acquisition of the celebrated Ilbert collection of clocks (1958,1006 collection), prints and other related materials made possible by the generous donation of funds by Gilbert Edgar CBE Ilbert's watches were then acquired using funds provided by Gilbert Edgar, public donations and government funds.
- Britain, Europe and Prehistory
- Registration number
- Additional IDs
Previous owner/ex-collection number: CAI.0980 (Ilbert Collection)
Previous owner/ex-collection number: N44 (Ilbert Ledger)