- Museum number
MOVEMENT AND DIAL OF A LEVER WATCH WITH FIVE-MINUTE-REPEAT.
3/4 plate; going barrel; gold train wheels; club tooth lever escapement; patent safety pinion.
Slide-operated 5-minute repeat sounding on two wire gongs; keyless winding; rocking-bar hand set.
White enamel dial, hours I-XII, subsidiary seconds.
- Production date
Diameter: 37.80 millimetres (back-plate)
Diameter: 43.60 millimetres (dial)
Thickness: 12.90 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
American Waltham Watch Co
Waltham USA, 1888
Flat minute repeating watch movement with a club tooth lever escapement.
Signature: On the dial "Waltham", on the back plate "AMERICAN WALTHAM WATCH CO 3794189 Patented 1888" and "SAFETY PINION"
Dial and Hands: Cannister dial with sunk subsidiary dial. In the counter-enamel, in black, 89. Blued-steel spade hands, blued-steel seconds hand.
Ebauche Marks: 4189
Frame: Of nickel silver, 3/4 plate design. No pillars, the back plate being machined from the solid. On the under side of the pallet bridge and of the balance cock 94189.
Barrel and Mainspring: Inside the going barrel and the cover 94189.
Barrel I. diameter 16.5 mm., height 2.7 mm.
Mainspring: height 2.6 mm., thickness 0.19 mm.
Arbor: diameter 5.4 mm., snailed.
Hooking: T piece.
Train: The centre and fourth wheels and the escape wheel of gold, the third of gilded brass, all wheels with five crossings except escape wheel which has four. High quality pinions.
Jewelled: From the third onwards with additionally the back centre which has a screwed setting, as have the balance jewels. Also ruby endstones for the balance pivots. All the others rubbed in. The pivots of the repeating train also jewelled.
Escapement: Club tooth lever, straight line layout, short lever, double roller, impulse pin D shaped. The table of the roller in gold, the small roller steel. Equidistant locking. The escape wheel gold with wide teeth convex across their width. One piece lever, the pallet stones exposed with flat acting faces. Adjustable banking pins.
Number of teeth embraced 3 ½.
Balance and Spring: A split bimetallic balance, the compensation and quarter screws of gold. Scratched under the arm 3794189. The balance diam. 17.0 mm, thickness 1.3 mm. Blued-steel flat spiral spring with terminal curve and 14 3/4 turns.
Means of Regulation: Index on the balance cock, the end of the index a fork straddling an eccentrically pivoted cam itself with a tail registering against a micrometer scale with engraved "S F".
Train Counts and Beat Rate:
Great wheel (barrel) 85
Centre wheel 80 pinion 12
The centre wheel crossing so bad that the wheel should have been scrapped.
Third wheel 75 pinion 10
Fourth wheel 80 pinion 10
Escape wheel 15 pinion 8
Beat Rate: 18,000
Motion Work: cannon pinion 14, minute wheel 42
minute pinion 12, hour wheel 48
Repeating Work: A geared lever winds the repeating arbor. All or nothing work is fitted. After the hours are struck as a series of single blows each 5 minutes is struck as a double blow so that 11.55 is struck as 11 single blows on one gong followed by 11 blows on both of the gongs.
Keyless Work: Side lever operated rocking bar mechanism.
Dimensions: Movement diameter 43.3 mm., height 12.2 mm.
Provenance: Formerly in the Ilbert collection. Ilbert purchased this from Malcolm Gardner 3/10/1936.
- Not on display
Latest: 3 (2017)
- 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.0905 (Ilbert Collection)
Previous owner/ex-collection number: P91 (Ilbert Ledger)