wrist-watch
- Museum number
- 1987,1012.6
- Description
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ROLLED-GOLD CASED CLUB-TOOTH LEVER WRIST-WATCH.
Wrist-watch.
Half-plate movement.
Club-tooth lever escapement.
White enamel dial with minute circle; Roman hour numerals; the XII in red; sunk subsidiary seconds; at each hour and below XII are large luminous painted discs.
Blued-steel hands; pierced and in-filled with luminous paint.
Rolled-gold case with hinged back and snap-on glazed bezel.
- Production date
- 1913
- Dimensions
-
Diameter: 32.60 millimetres
- $Inscriptions
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- Curator's comments
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Associated dates : 1914 (August).
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Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Waltham Watch Co.
U.S.A., c. 1913
Wrist watch with club tooth lever escapement.
Signature: On the dial 'Waltham', on the train bridge 'AWW Co WALTHAM MASS 15 JEWELS'. ON the barrel bridge USA 1967 3527.
Case: A three piece rolled gold case. In the hinged back 'STAR 10 YEAR DENNISON WATCH CASE Co 502658 and 15'. A snap on bezel. On the back of the case is engraved 'Private Utley (B>T>) C Coy 18th Service Battalion ROYAL FUSILIERS aug 1914'.
Dial & Hands: A flat enamel dial with a sunk subsidiary seconds dial. Heavy luminous dots at the hours with a double dot at XII. Blued-steel skeleton hour and minute hands filled luminous and a blued-steel seconds hand.
Movement:
Ebauche Marks: 673527.
A dust protection ring surrounds the movement.
Frame: A nickel silver movement, damaskeened. A bridge for the barrel centre and third wheels, another for the fourth wheel and the escape wheel, under this latter bridge is 673527.
Cocks for the pallets and the balance, under the latter is 73527.
Barrel and Mainspring: A separate arbor passes through the great wheel which has a snailed arbor integral with it. A steel barrel internal diameter 11.75 mm, height 2.0 mm.
Mainspring: height 2.0 mm, thickness 0.115 mm.
Barrel Arbor: diameter 3.85 mm, snailed.
Hooking: Round.
Train: All the wheels are of gold, the centre wheel, third and fourth wheels with five crossings. The escape wheel with four.
Jewelling: Jewelled bearings from the third wheel onwards, all the jewels in chatons except for the balance jewels which are in screwed settings. Clear sapphire endstones to the balance jewels.
Escapement: A straight line layout, club tooth lever escapement with short lever, double roller and D-shaped impulse pin. The exposed pallet stones have flat acting faces. The gold steel escape wheel has convex impulse faces. Adjustable banking pins.
An equidistant locking escapement.
No. of teeth embraced 3½.
Balance & Spring: A split bimetallic balance with brass compensation screws and two gold timing screws. Balance diameter 11.45 mm,, thickness 0.9 mm. The balance spring is missing.
Means of Regulation: A micrometer index on the balance cock registers against a divided scale with 'F S' engraved on the balance cock table.
Train Counts and Beat Rate:
Great wheel 70 (barrel)
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
Keyless work: Negative set keyless work. A lever with a head set into the movement edge will, when pulled out put the keyless work into the wind position so as to allow the watchmaker to work on the movement when it has been removed from the case without the keyless work interfering with the freedom of the train. Once out of the case the keyless work is normally in the hand set position with negative set keyless work.
Dimensions:
Case: Diameter 32.1 mm., height 11.2 mm., over the glass.
Movement: Diameter 28.4 mm., height 7.0 mm.
Provenance: Purchased in 1897 with the aid of funds from the Dingwall Bequest.
- Location
- Not on display
- Condition
- Latest: 3 (Jun 1995) Balance-spring missing.
- Acquisition date
- 1987
- Department
- Britain, Europe and Prehistory
- Registration number
- 1987,1012.6