- Museum number
NICKEL-SILVER CASED PIN-PALLET LEVER WATCH.
Ingersoll Reliance pocket watch.
Movement with snailed plates; club-tooth lever escapement with steel balance and blued steel spiral balance spring; keyless winding and hand setting.
White enamel dial with heavy Arabic numerals 1-12 and minutes indicated at five minute intervals 5-60.
Blued steel hands; minute hand missing.
Nickel silver case with screw-on back and bezel; engine-turned decoration; no glass.
Diameter: 50.25 millimetres (case)
Diameter: 40.90 millimetres (dial)
Thickness: 14.50 millimetres
- Curator's comments
Compare with 1983,1012.86
Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Ingersoll
U.S.A., c. 1924
Keyless pocket watch with club tooth lever escapement.
Signature: On the dial 'Ingersoll RELIANCE'.
On the back plate 'ROBT. H. INGERSOLL & BRO.U.S.A. 7 JEWELS' and the number 538938.
Case: A nickel plated open face case with screw back and bezel. The back is engine turned and the band has two knurled edges. The glass is loose.
Dial & Hands:
An enamel dial of basically cannister design fixed to the movement by three spring clips stamped from the body of the metal backing plate. Black Arabic numerals and minute marks and a subsidiary seconds dial.
Blued-steel spade hour hand, the minute hand missing and a blued-steel seconds hand.
Ebauche Marks: MODEL 1677 under the dial.
Frame: A nickel silver movement finished with a Geneva stripe. Three quarter plate layout with the various recesses machined from the solid. A cock for the pallets and one for the balance.
Barrel and Mainspring: A going arbor with the great wheel mounted directly on the arbor. A steel barrel mounted on a square on the end of the arbor opposite to the great wheel.
Barrel: internal diameter 17.0 mm, height 1.75 mm.
Mainspring: height 2.15 mm, thickness 0.25 mm.
Barrel Arbor: diameter 5.8 mm, snailed.
Hooking: Punched from the barrel wall.
Train: All the wheels gilded, the centre wheel, third and fourth wheels with five crossings, the escape wheel with four.
Jewelling: Jewelled bearings for the balance only, the jewels in brass chatons also containing the endstones.
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. A brass escape wheel with four crossings.
An equal impulse escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic balance with brass screws. Balance diameter 16.0 mm, thickness 1.1 mm. A blued steel flat spiral spring with 8 ½ turns.
Means of Regulation: An index on the balance cock registers against a divided scale with 'F' and 'S' stamped on the balance cock table.
Train Counts and Beat Rate:
Great wheel 78 (barrel)
Centre wheel 80 pinion 10
Third wheel 75 pinion 10
Fourth wheel 80 pinion 10
Escape wheel 15 pinion 8
Beat rate 18,000
Motion work: cannon pinion 12
minute wheel 36, minute pinion 10
hour wheel 40
Winding System: Negative set keyless work.
Case: Diameter 49.5 mm., height 14.3 mm.
Movement: diameter 42.8 mm, height 9.0 mm.
Provenance: Donated by the Heron Corporation in 1983.
- Not on display
Latest: 3 (2017)
3 (Mar 1996) glass is loose
- Acquisition date
- Britain, Europe and Prehistory
- Registration number