Rare Robin-type movement, circa 1860, signed for the Patentees.
Three-quarter plate, hollow back (no brass edge) fusee movement with cap jewels on balance and escape, and a jewel at the 4th, the 16-size frame stamped, as usual, HF (most likely Henry Fletcher), Prescot. London Patent escapement with lever-type escape and unlocking and chronometer-style impulse in one direction only, via a radial set jewel in the roller. Compensation balance, spiral balance-spring. Enamel dial signed CHRONOMETER 2617, gold hands. 44.5 mm, 8.5 mm deep, not including centre arbor.
London Patent 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, the last known number being just over 3000. A second Patent was taken out for the Patent Union Escapement by William Holland & Sons Ltd and Charles Kelvey - Patent No 233, January 1859. See also Randall, The Time Museum Catalogue of Chronometers, items 127 and 128. NB: This is one of very few that are known to bear the names of the Patentees.
Dial with hair cracks, lacking index and broken hour hand. Otherwise looks to be complete and in good condition, but fusee chain partly off barrel and not applying pressure on train. It looks as though it should work once fixed, but sold as not working.
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