Finely engraved watch cock with index, its free end moved by a key operated longitudinal screw and ratchet (missing), mounted on a gilded disc engraved for White. Plate diameter 48 mm.
Edward White, originally working for E J Dent, operating from 20 Cockspur St, Pall Mall. Chronometer, clock and watch maker at this period. Later working in The Haymarket and sole agents for L Gallopin & Co, late Henry Capt of Geneva. Medals awarded to White at the Exhibitions in London in 1862, Dublin 1865 and Paris 1867, this model of which I believe was probably part of their display, a “great display and taste in watches” for which they received their medal in 1862
NB: I can find no reference to this form of fine adjustment, although similar examples are recorded in both the UK and America. It was never patented, the model makes no claim that it was, nor can I remember ever having seen an example in an E White watch.
Good dull condition, not having been cleaned by me, and lacking the ratchet wheel but retaining its spring click which makes replacing the ratchet by one of the right size relatively easy. A unique survival.