- Museum number
LEATHER CASED LEVER FOB-WATCH.
Octagonal movement with keyless winding.
Club-tooth lever escapement; train jewelled to centre.
Black painted dial with outer circle 1-31 in red for date; luminous-painted Arabic hour numerals within a white minute circle; subsidiary seconds.
Luminous-painted hour and minute hands; gold seconds hand; blued-steel calendar hand with red arrow-head pointer.
Stainless-steel case with snap-on back and bezel; outer case of leather-covered brass disc with watch at centre.
Attached to pendant ring in double leather thong with leather covered button at end.
- Production date
Diameter: 46.20 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Jaeger-LeCoultre
Keyless wound fob day date watch with a club tooth lever escapement.
Signature: On the dial Mido and SWITZERLAND . On the back of the movement is JAEGER-LECOULTRE 115598 98 MIDO LTD SWISS 15 FIFTEEN JEWELS UNADJUSTED.
Case: A stainless case with a snap on bezel and back.
A brown leather thong supports the brown leather surround to the case. At its upper end the thong terminates in a leather covered button so that the watch can be attached to the lapel and put into a breast pocket. The case band is set into the leather and carries a push piece for setting the date.
Inside the back is stamped STAYBRITE FAB SUISSE and the number 39874.
Dial & Hands: The black painted metal dial has luminised Arabic numerals white minute marks and a sunk subsidiary seconds dial. An aperture below the 12 shows the day in red and the date circle is around the outside of the dial running from 1 - 31, also in red. The skeletonised hands are also luminised. A gilt seconds hand. The date hand has a red arrow head.
The dial is secured by screws, one at 12 and one at 6 o'clock. The day dial is white painted with the days in English in red.
Movement: The rectangular brass movement is set in a round disc and is nickel plated, the back is finished with a broad Geneva stripe. The major part of the rest of the movement is finished by spotting.
Ebauche Marks; 590 on the front plate below the balance.
Frame: Bridges for the barrel and centre, the third fourth and escape wheel, cocks for the pallets and the balance.
Barrel and Mainspring: A going barrel
Barrels: I. diameter 10 mm., height 1.2 mm.
Mainspring height 1.15 mm., thickness 0.10.
Arbor: diameter 3.4 mm., snailed.
Hooking: Punched from the barrel wall.
Train: The brass wheels are gilded, the centre wheel, third and fourth wheels with five crossings, the steel escape wheel with four.
Jewelling: Jewelled bearings from the third wheel onwards, all the jewels pressed in. Additionally the centre hole on the bridge is jewelled. Ruby 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 steel lever has exposed pallet stones with flat acting faces. A steel escape wheel.
An equal impulse escapement.
No. of teeth embraced 3½.
Balance & Spring: a monometallic balance with gold screws. Balance diameter 8.55 mm, thickness 0.56 mm. A blued steel flat spiral spring with 10 ¾ turns.
Means of Regulation: An index on the balance cock registers against a divided scale with engraved 'F S' and 'A R'.
Train Counts and Beat Rate:
Great wheel 84 (barrel)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 6
Beat rate 18,000
Motion work: Cannon pinion 10, minute wheel 30, pinion 8, hour wheel 32.
Calendar work: The hour wheel drives a 24 hour wheel with 64 teeth. On the hour wheel pipe is mounted a date wheel with 31 star teeth. On a post is mounted the day wheel. The latter two wheels are indexed by a pin on the 24 hour wheel.
Winding System: Stem set positive keyless work .
Case: The leather surround diameter 46 mm., thickness 4 mm. bezel diameters 30.3 mm., height over the glass 10.5 mm.
Movement: length 25 mm., width 18.2 mm., height 6 mm.
Provenance: Donated by H.R.H. The Duke of Gloucester in 1986.
- Not on display
- Acquisition date
- Britain, Europe and Prehistory
- Registration number