- Museum number
MOVEMENT AND DIAL OF AN EIGHT-DAY LEVER WATCH.
Lever escapement visible through dial; winds by rotating the back.
Three-quarter white enamel dial with inlaid silver vines, cut away to provide room for balance and balance-bridge.
Gold spade hands, not original.
- Production date
- 1906 -1915
Diameter: 42.40 millimetres (dial-plate)
Thickness: 11.10 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Switzerland, c. 1910.
8 Day watch movement with a club tooth lever escapement.
Signature and Inscriptions: On the dial "HEBDOMAS PATENT" and "SWISS MADE" in black, "8 DAYS" in red. Under the dial on the front plate "HEBDOMAS" and three stars. The back plate numbered 44393. On the back of the barrel, which is heavily decorated, are the legends "SPIRAL BREGUET LEVEES VISIBLES 8 JOURS
ANCRE, QUALITE SUPERIEVRE GARANTIE". 4 medals shown in gilt - Chicago 1892, Geneve 1896, Paris 1900, Milan 1906. On the arbor nut "8 DAYS SWISS MADE".
Dial and Hands: The dial cut away to reveal the balance and balance bridge. An offset chapter ring, the Roman numerals in black. The minute marks in silver pellatons with those at III, VI, IX and XII in gold. On either side of the chapter ring are floral decorations in gold and silver pellatons. Gold spade hands.
Ebauche Marks: see under signature.
Frame: Two stage movement with a large barrel almost the size of the back plate. The geared arbor drives the pinion of the first arbor which is an intermediate and drives the centre wheel. A half plate layout with a cock for the escape wheel and cocks for pallets and balance, the latter engraved.
Under the cocks and bridges is stamped 93 with the full number 44393 under the front plate.
Barrel and Mainspring: Slipping mainspring in the barrel which has a going arbor. The barrel has winding teeth around its edge. Barrel I. diam: 36.0 mm, h. 3.1 mm.
Mainspring: h. 2.9 mm, t. 0.27 mm.
Arbor: diam. 6.35 mm., not snailed. There are five notches in the barrel wall. The nibbed end of a thick single turn of spring (to which the mainspring is hooked) moves from one notch to the next when the pull of the mainspring becomes sufficiently strong.
Train: The brass wheels are not gilded, all have five crossings except for the escape wheel which has four.
Jewelled: Only at the balance pivots with ruby endstones.
Escapement: Club tooth lever, straight line layout, short lever, double roller with a steel D shaped impulse pin. Brass escape wheel with chamfered teeth. Pallet stones exposed, the acting faces flat. The pallet staff is screwed in. The pallet body is brass.
An equal impulse escapement.
Number of teeth embraced 3½.
Balance and Spring: A monometallic uncut balance with a 'self compensating' spring. The balance diameter 13.7 mm., height 0.8 mm. The flat spiral spring with 11 turns and a terminal curve.
Means of Regulation: An index mounted on the balance bridge registering against the dial edge which is marked "S F" and "A R".
Train Counts and Beat Rate:
Great wheel (arbor) 34
Intermediate wheel 80 pinion 16
Centre 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: cannon pinion 10, minute wheel 30
minute pinion 8, hour wheel 32
Winding System: Conventional side set positive keyless work, the stem is broken.
Dimensions: Movement diameter 42.2 mm., height 11.5 mm.
Provenance: Formerly in the Ilbert collection. Ilbert purchased this from Malcolm Gardner 29/9/1932.
- Not on display
Latest: 4 (2017)
4 (1994) Very dirty.
- 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.1015 (Ilbert Collection)
Previous owner/ex-collection number: M291 (Ilbert Ledger)