Rare centre-seconds Patent Union Chronometer movement, circa 1867.
Three-quarter plate, hollow back (no brass edge) fusee movement with cap jewels on balance and escape, and a jewel at the centre (3rd), the 18-size frame stamped, as usual, HF (most likely Henry Fletcher, Prescot). Patent Union escapement with lever-type escape and duplex-type unlocking of the lever. Compensation balance, spiral balance-spring. Enamel dial with sunk centre signed CHRONOMETER 2617. 46.5 mm, 9.5 mm deep, not including centre arbor.
Monk & Gilbert, later Monk Brothers, Bolton, retailers.
Patent Union Chronometer escapement, a development of George Morton's original Patent No 2434, October 1857. As development took place the watches are variously engraved, if at all: Morton's Patent; Morton's Patent Improved; Patent Chronometer; London Patent Chronometer; and finally Patent Union Chronometer, all numbered within the same sequence. See my recent Horological Profile on these Morton's Patent watches for full details.
Lacking hands and index, with broken balance pivot and ruby roller partly chipped. Otherwise in good condition and fully restorable. Not working.
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