- Museum number
GOLD CASED CENTRE-SECONDS AUTOMATIC CLUB-TOOTH LEVER WRIST-WATCH WITH CENTRE-DATE HAND AND GOLD-PLATED EXPANDING BRACELET.
Movement with automatic winding; club-tooth lever escapement and Incabloc shock protection.
Silver-coloured metal dial calibrated 1-31 for the date around the outside; Arabic hour 2, 4, 6, 8, 10 and 12 with raised gold lozenge marks for the odd numbers.
Gold hour, minute and centre-seconds hands; hour and minute hands also luminous painted; steel and red-painted date indicator.
Fourteen-carat gold case with screw-on back.
Stainless-steel and gold-plated expanding bracelet.
- Production date
Diameter: 34 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Mido
Switzerland, c. 1953
A gold cased centre seconds self wound wrist watch with date work and a club tooth lever escapement.
Signature: On the dial is 'Mido MULTIFORT DATOMETER GRAND LUXE SUPER - AUTOMATIC MADE IN SWITZERLAND'
Case: A two part 14 ct. gold case with a screwed back. Stamped into the case band in a shield cartouche is the Geneva mark - a squirrel with beneath the letter G, this is also stamped on the inside of the back.
On the outside of the back is engraved 'NICK A HAPPY PARTNERSHIP SAMHONG KONG 19-5-53'. On the inside of the back is 'Mido LTD SWITZERLAND BRIT. PAT. 385509', in a cartouche 56 14K 0.585. There is also stamped a key with on its flag 11. Between two of the case lugs is another number 6101.
Dial & Hands: A silvered dial with the Arabic even numerals luminised and diamond shaped batons for the odd number positions. The minute makings in black with between 1/5th seconds marks. Around the dial edge is the date ring with the days numbered 1 - 31. Stamped into the back of the dial is a circle with beneath a 'W' embracing an 'E', also the number 308 1.(1) Gilt hands with the hour and minute hands skeletonised and filled luminous. The date hand painted white with a crescent tip painted red.
On the front plate under the dial is 'BREVETE' followed by the Helvetia cross, also stamped are 10 minute marks for timing the watch before the dial is applied.
Ebauche Marks: On the self winding weight is D 917.
Frame: A nickel silver frame with a bridge for the self winding weight, this engraved '17 SEVENTEEN JEWELS'. A bridge for the self winding wheels, with on this 'UNADJUSTED'. The basic movement has a bridge for the keyless and barrel another for the train, this latter carries the buffer springs. A cocks for the balance and another for the pallets.
Barrel and Mainspring: The going barrel with a recessed cover. Barrel: I. diameter 8.2 mm., height 1.4 mm.
Mainspring: Height 1.4 mm., thickness 0.13 mm.
Barrel Arbor: Diameter 2.75 mm., snailed.
Hooking: A slipping mainspring.
Train: All the wheels 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. Incabloc shock protection to the balance.
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 steel escape wheel with four crossings.
An equal impulse escapement.
No. of teeth embraced 3½.
Balance & Spring: A monometallic balance with brass screws. Balance diameter 9.4 mm, thickness 0.6 mm. A 'self compensating' flat spiral spring with 10 turns.
Means of Regulation: An 'INCASTAR' device which reels in the balance spring to effect regulation. A type of index carries the whole device so the beat setting can be accomplished. The capstan wheel that is turned to regulate the watch is stamped + and- with a double arrow between.
Train Counts and Beat Rate:
Great wheel 70 (barrel)
Centre wheel 64 pinion 10
Third wheel 60 pinion 8 carries a wheel of 80 to drive the idle centre seconds pinion of 10
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 6
Beat rate 18,000
Motion work: cannon pinion 10
minute wheel 30, minute pinion 8
hour wheel 32
Winding System: Conventional stem set positive keyless work. The bolt spring is broken.
Self winding work: The 'L' shaped weight works between buffers and winds in one direction only.(2) The weight carries a ratchet which engages with the first in the train of gears that winds the barrel ratchet wheel.
The last wheel whose pinion drives the barrel ratchet wheel has a clutch between the pinion and the wheel thus enabling manual winding to be done without turning the self winding train.
Date Work: The date wheel with 31 triangular shaped teeth indexed by a pin on a wheel of 30 this in turn is driven by a wheel of 15 on the hour wheel.
Case: Diameter 33.7 mm., height 12.1 mm., over the glass.
Movement: diameter 27.8 mm., height 8.8 mm.
Provenance: Purchased in 1989 with the aid of funds from the Dingwall Bequest.
(1) This is one of the Mido trade marks.
(2) See p.267 in Wristwatches.
- Not on display
- Acquisition date
- Britain, Europe and Prehistory
- Registration number