- Museum number
MOVEMENT AND DIAL OF A CLUB-TOOTH LEVER HUNTER-CASED WATCH.
Missing. With the winding stem at 3 o'clock, the case would have been of the hunter design.
DIAL & HANDS:
White enamel canister dial with sunk subsidiary seconds dial. Outer circle of minutes 5-60 in red. Hours 1-12 in black; seconds 10-60 in black. Pierced gold hands.
3/4-plate movement with four ringed pillars retained by screws. A separate plate screwed to the dial side of the front-plate provides bearings for the recessed train wheels. Going barrel without stop-work; four wheel train. Club-tooth lever escapement with gold escape wheel. Jewelled bearings for train and escapement from the rear centre to the balance, those for the balance with endstones. Spiral blued-steel balance spring with overcoil. Screw-adjusted regulator and index on the balance-cock.
Keyless winding with sliding-pinion on the stem. The hand-set engaged by disengaged by moving two levers in the case band.
- Production date
Diameter: 44.50 millimetres (dial)
Thickness: 9.30 millimetres
- Curator's comments
- Comment from Richard Good, Catalogue of Watches in the British Museum. Vol. V (Unpublished manuscript)
Made by Glashutter Prazisions Uhren Fabrik Akt. Ges.
Germany, c. 1930
Watch movement with a club tooth lever escapement.
Signature: On the dial 'GLASHUTTER PRAZISIONS UHREN FABRIK AKT. GES. GLASHUTTE I/S'.
On the back plate 100454 'Glashutter Prazisions Uhren Fabrik Akt. Ges.'.
Dial & Hands: A canister dial with a sunk subsidiary seconds dial, black Arabic numerals A black minute circle without around it red numerals for the five minutes 5 - 60. Typical Louis XVI hands, gilt with a gilt seconds hand with a tail.
Ebauche Marks: Only the number 100454 under the dial.
Frame: A three quarter plate layout the back plate supported by three turned pillars and secured by screws. A cock for the pallets and one for the balance. Under the balance cock is stamped 454 under the pallet cock is 54. Under the back plate is stamped 454.
Barrel and Mainspring: Going barrel with Geneva stopwork, but the finger now removed.
Barrel: I diameter 17.8 mm., height 2.5 mm.
Mainspring: height 2.4 mm., thickness 0.23 mm.
Barrel Arbor: diameter 6.0 mm., not snailed.
Train: All the wheels gilded, the centre, third and fourth wheels with five crossings. The gold escape wheel with four. The train of high quality.
Jewelling: Jewelled bearings from the centre wheel onwards, but no jewel at the centre in the front plate. All the jewels rubbed in. Ruby endstones to the balance jewels, that in the cock in a screwed gold setting.
Escapement: Club tooth lever, a straight line layout, short lever, effectively a double roller with the impulse jewel set into the balance arm. The impulse jewel of triangular section. The safety roller of steel. Pallet stones convex on the impulse faces and on the entrance locking face but flat on the exit locking face. Escape wheel of gold, teeth not chamfered. Pallet frame of gold.
An equidistant locking escapement.
No of teeth embraced 3½.
Balance: A split bimetallic balance with gold quarter and compensation screws. Balance diameter 16.7 mm., height 1.5 mm. The balance rim split to give a friction fit to the quarter screws in the usual Glashutte way. Blued-steel flat spiral spring of 14 turns with a terminal curve.
Means of Regulation: Index on the balance cock registering against a vernier scale, the index micrometrically controlled by a screw and whiplash spring. The cock engraved and with 'L S'.
Train Counts and Beat Rate:
Great wheel 90 (barrel)
Centre wheel 80 pinion 12
Third wheel 75 pinion 10
Fourth wheel 70 pinion 10
Escape wheel 15 pinion 7
Beat rate 18,000
Motion work: cannon pinion 12
minute wheel 36, minute pinion 10
hour wheel 40
Winding System: Side set keyless work. When the side setting is done the bar that moves the castle wheel is locked by a catch piece that releases it when the button is pressed. The stem is integral with the movement.
The barrel ratchet wheel is on a square and is retained from the side by the typical dog screw as was the normal Glashutte practice.
Dimensions: Movement diameter 44.5 mm., height 10.4 mm.
Provenance: Purchased in 1994.
- Not on display
Latest: 4 (2017)
5 (Jun 1996).
4 (1994)Rust on steel winding wheels.
- Acquisition date
- Britain, Europe and Prehistory
- Registration number