- Museum number
BRASS CASED EIGHT DAY TRAVELLING CLOCK WITH LEVER ESCAPEMENT.
Travelling clock in circular brass case with hinged back and screw-on bezel; nickel-plated movement with engine-turned decoration; club-tooth lever escapement with uncut balance and spiral balance spring; white enamel dial with Arabic hour numerals; blued-steel hands; keyless-winding and hand-setting, button at 6 o'clock; leather(?) outer case now missing.
Diameter: 64.20 millimetres (case)
Diameter: 51.10 millimetres (dial)
Thickness: 20.80 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
La Chaux de Fonds, Switzerland. c. 1930
8 day watch with club tooth lever escapement.
Signature: "Octo + Mon Magnetic +" on the barrel cover. On the barrel retaining plate "PATENT + 28536-32" and "116871". On the inside of the front plate "87259 4 11".
Case: A metal case for a three fold travelling clock, the inside of the hinged back stamped 68 and H. The screwed on bezel is stamped inside 68.
Dial and Hands: Dial marked "8 DAYS". A chip repaired near to 11 o'clock. Hair line cracks in the dial. A false plate supports the dial which is of larger diameter than the movement, namely 51.9 mm. Blued-steel spade hands.
Ebauche Marks: 116871.
Frame: The barrel covers nearly all of the back plate. The balance is located and supported by a circular bridge that fits into a recess in the back plate and is located by screws.
Barrel and Mainspring: Going barrel I. diameter 33.2 mm., height 4.0 mm.
Mainspring: height 4.0 mm., thickness 0.29 mm.
Arbor: diameter 5.4 mm., not snailed.
Hooking: 6 notches in the barrel wall provide restraints for the slipping mainspring.
Train: Brass wheels gilded and with five crossings except for the escape which has four.
Jewelled: At the balance only, with ruby endstones. The jewels rubbed in.
Escapement: Club tooth lever, straight line layout, short lever, double roller, impulse pin elliptical in section. Pallet stones exposed. Escape wheel brass. Pallet staff screwed in. Escapement with equidistant locking. Number of teeth embraced 3½.
Balance: Monometallic balance, diam: 13.3 mm, h. 0.90 mm. Self compensating flat spiral spring with 11½ turns.
Means of Regulation: Index registering against a divided scale on the balance bridge with engraved 'S F' and 'R A'.
Train Counts and Beat Rate:
Great wheel (mounted on the barrel arbor) 36 teeth.
Intermediate wheel 64 pinion 13
Centre wheel 64 pinion 12
Third wheel 60 pinion 8
Fourth wheel 60 pinion 8
Escape wheel 15 pinion 6
Beat Rate: 18,000
Motion Work: cannon pinion 15, minute wheel 30, minute pinion 8, hour wheel 48.
Winding system: Normal positive set keyless work.
Dimensions: Case diameter 64.3 mm., thickness (over the glass) 21 mm.
Movement diameter 43.2 mm., height 14.4 mm.
Provenance: Donated by J E Sayers in 1984.
For a similar example see registration no. 1958,1201.3137 (L 8/4).
These watches were made by Ernest Tolck, for example see page 243 of the 'Horological Trades Directory' of 1928.
- Not on display
- Latest: 3 (2017)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number