- Museum number
SILVER HUNTER-CASED LEVER WATCH.
Lever escapement; cut bimetallic balance fully jewelled train.
Silver hunting case; hallmarked.
White watch-paper with printed inscription on obverse .
- Production date
- 1872 (case)
Diameter: 48.70 millimetres (case)
Diameter: 38.80 millimetres (dial)
Diameter: 47.42 millimetres (watch-paper)
Thickness: 16.10 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by J. Clarke
Silver hunter-cased ratchet tooth lever watch
On the dial '7'
On the back plate 'J. Clarke. LONDON. 7 .'
Case: Engine-turned, silver consular hunter case with the London hallmark for 1872, the casemaker's mark IH incuse.(1) The case is also punched inside the dome with the numbers 1828 and 7. The number 1 is punched inside the dome and inside both front and rear covers. The case band has reeded decoration and there is a band of snailed engine-turning around the winding hole in the dome. The silver pendant bears the maker's mark W.S in cameo. A sprung push-piece in the pendant releases the front cover. Inside the back of the case is a watch paper of CAMERER CUSS & Co. New Oxford Street, London.
Dial & Hands:
Flat dial with a sunk centre to the subsidiary seconds dial. Gold spade-pattern hour and minute hands and replacement blued-steel seconds hand. There is a chip on the edge of the dial near the IX. The number 28 is fired into the counter-enamel.
Dial-plate: None intended.
Dust-cap: Punched JAK on the inside and scratch numbered '28' inside the barrel bulge.
Ebauche Marks: 10 0 JW.(2)
Frame: Full plate layout, the back plate supported by four turned pillars. The balance cock engraved all over with foliate scrolls and a lozenge pattern and is and scratched '28' on the underside. There is a push-on dust-sleeve on the winding square.
Fusee, Barrel and Mainspring:
Fusee: four-turn fusee with Harrison's maintaining power and a steel maintaining ratchet wheel.
Barrel: internal diameter 15.0 mm, height 2.70 mm.
Mainspring: height 2.55 mm, thickness 0.25 mm.
Barrel Arbor: diameter 4.8 mm, not snailed.
Hooking: originally square but now round.
Train: All the wheels gilded, the centre wheel solid, the third and fourth wheels with five crossings.
Jewelling: Jewelled bearings from the fusee onwards with the exception of the centre wheel. Ruby endstones to the escape wheel and the balance.
Escapement: An acute-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 gilded escape wheel has three crossings.
A mixed impulse escapement.
No. of teeth embraced 32.
Balance & Spring: A split bimetallic balance with brass compensation screws. Diameter 16.80 mm, thickness 1.2 mm. Blued-steel flat spiral spring with 10 3/4 turns pinned to a polished steel stud screwed to the back plate.
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 (fusee)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 7
Beat Rate: 15,428.571.
Motion Work: cannon pinion 14
minute wheel 42, minute pinion 12
hour wheel 48
Winding System: Key wound.
Case: diameter 48.7 mm, height 16.0 mm.
Movement: diameter 39.3 mm, height 12.0 mm, pillar height 2.75 mm
Provenance: Bequeathed by F. R. S. Rogers Esq. in 1972.
(1) John William Hammon, watch-case maker, first registered at Goldsmiths' Hall 3/1/1843 with a business at 35, Clerkenwell Green and later at 11, Sekforde St. Clerkenwell. See Culme pp. 156, 157, 207.
(2) John Wycherley, ebauche maker of Prescot.
- Not on display
Latest: 5 (Jan 2019) weeping
5 ( date?) weeping - mmnt ok
2 (Feb 1995)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number