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1010: Gents Mc.Master & Son Dublin Chronometer, Gold 18K, 1858

Gross weight 125g
Accessories: newer key
Case: 4555, hallmark London 1858, heavy hinge case, gold 18K, guilloche pattern, free monogramm shield, mineral crystal, gold dust cover, D=50.5mm
Dial: enamel, inserted sunk sub second
Movement: 4555, 2709, Mc.Master & Son Dublin, calibre 19.75''', gold plated, finely engraved balance cock, 15 jewels, key wind and set, fusee/chain, fusee with spring to maintain power during winding, chronometer escapement with spring detent 9000 P/h, bimetallic screw balance under diamond end-stone, cylindrical hairspring with Philips-curve on both ends
Condition: C1, D1-2, M0, serviced 08/2005, dial degraded by hardly visible damage at the periphery, else D0. The movement surfaces are as perfect as quicksilver-alloy gold plating allows, the darker area is the fuzzy mirror image of the camera lens.

The summit of precision watch making
In early lever escapements the balance was continuously connected to the escapement wheel; nevertheless acceptable accuracy was obtained. But only the detached lever escapement allows the accuracy as we watch it today at certified chronometers.
It was called "detached" because the balance could almost freely oscillate - however not completely free: Twice per oscillation periode, balance and escapement wheel are shortly coupled via lever, disturbing the oscillation.
Still more detached is the chronometer escapement: It couples balance and whell only once per periode, and this much shorter than in the best lever escapement. Morover, only negligible mass is moved, if the escapement is designed with a spring detent after Earnshaw. Thus a "more detached" escapement is hard to imagine, and not for nothing this was the common escapement for marine chronometers.

Sold in Auction

Date 8-25-05

High bid EUR 0.00 (~CHF 0.00)

Reserve EUR 3300.00 (~CHF 3692.47)

Not for Sale!
The watch presented here is not for sale. It was offered or sold as mentioned above a longer time ago. This archive is just a market overview and price guide, e.g. for evaluation of comparable watches. Moreover, images and descriptions can help for dating and checking the authenticity of watches.

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