18ct yellow gold barrel edge case with engine turned rear cover and deeply engraved ‘rose’ bezels hallmarked London 1822, casemaker RM (Robert Mansir, Clerkenwell). Capped fullplate fusee movement with cap jewels on balance (diamond) and escape, the cap stamped LxR, as often seen in the best London work of the period. Duplex escapement retaining its ruby roller. Steel balance, spiral balance-spring. Lovely engine-turned 18ct yellow gold dial with pink gold Roman numerals and matching pink gold hands. 52.5 mm diameter.
Thomas Moss, then at 24 Ludgate St, a well known London watch and clock maker.
NB: The escapement used in the watch is the standard English single-wheel variant of Tyrer’s Patent No 1311 of 1782. The Duplex escapement, as it has come to be known, was initially fitted with two escape wheels, one for locking and one for impulse. Very few of these English double escape wheel watches are known (later repairs utilising two lever escape wheels have confused certain writers), and it seems that English makers took to the single wheel arrangement almost immediately, as used by Moss in this movement. It was considered at the time as being as the best escapement for pocket wear, only losing out to the detached lever escapement due to the effect of wear caused by the roller acting on the escape’s locking teeth.
In fine original condition throughout, just lacking the original markings in the seconds ring, no doubt removed when being repeatedly cleaned over the years. The still crisp case showing just how beautiful this new style was, most surviving examples sadly showing the effects of much wear – bezels like this are usually either engraved with ‘roses’ or ‘shells.’ Serviced and guaranteed.