- Museum number
CHROME-PLATED CASED PIN-PALLET LEVER WATCH.
Ingersoll sports pendant watch.
Movement with nickel brass plates with snailed finish; pin-pallet lever escapement with jewelled bearings and endstones for the balance; keyless winding and hand-setting.
Silver coloured dial with Arabic numerals and subsidiary seconds dial.
Blued steel hands.
Nickel-plated case with snap-on back and bezel; outer rim has cut out areas for the winding button and to make provision for a chain or ribbon for hanging.
- Production date
Diameter: 42.50 millimetres (case)
Diameter: 27.30 millimetres (dial)
Thickness: 11.10 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Ingersoll
Switzerland, c. 1965
Pendant watch with pin pallet lever escapement.
Signature: On the dial 'INGERSOLL SPORTS' and 'SWISS MADE'
On the movement back plate also 'INGERSOLL SPORTS' and 'SWISS MADE'
Case: A chrome plated case with a snap on back and bezel. The outer extended rim of the case has cut out areas one for the winding button at 3 o'clock and a second at 12 o'clock to make provision for a chain or strap or ribbon for hanging.
Dial and Hands: A silvered dial with black Arabic numerals and minute circle, a subsidiary seconds dial. Blued steel hands, the minute hand missing. The dial is secured by screws one at 12 o'clock and one at 6 o'clock.
Ebauche marks: On the inside of the front plate is the number 8.
Frame: Nickel silver plates, the back plate is supported by four pillars and secured by screws, it covers the train and the barrel, there is a cock for the pallets and one for the balance.
Barrel and mainspring: A going barrel with 674 on the barrel bottom. There is a steel cover which carries a slipping minute wheel. Barrel I diameter 16.3 mm., height 1.85 mm.
Mainspring height 1.65 mm., thickness 0.14 mm.
Arbor: Diameter 4.3 mm., snailed.
Hooking: Pressed from the barrel wall.
Jewelled: Jewelled at the balance only. Ruby endstones, the jewels pressed in.
Escapement: A pin pallet lever escapement with an obtuse angle layout. Effectively a double roller with a brass impulse finger.
The lever is brass and the pallet pins are steel. The escape wheel is steel with four crossings. A mixed escapement.
The number of teeth embraced 3 ½.
Means of regulation: An index on the balance cock registers against a divided scale with engraved 'F S'
Train Counts(1) and Beat Rate:
Great wheel (barrel) 100 (rotates once in four hours)
Second wheel 50 pinion 10
Third wheel 48 pinion 10
Fourth wheel 50 pinion 10 carries the seconds hand.
Escape wheel 18 pinion 6
Beat rate 18,000
Motion work: cannon pinion 11, minute wheel 44, minute pinion 14, hour wheel 42.
Winding system: Normal positive set keyless work.
Dimensions: Case diameter 42.6 mm., height 11.4 mm., over the glass.
Movement diameter 30.0 mm., height 8 mm.
Provenance: Donated by the Heron Corporation Ltd. in 1983.
(1) The train is remarkable for the high numbers of teeth in the pinions when one considers that this is an inexpensive mechanism.
- Not on display
- Latest: 3 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number