Birch & Gaydon, Makers to the Admiralty, 153 Fenchurch St., London, Movement No. 2554, Case No. 2554, 52 mm, 125 g, circa 1907

A deck watch with 52,5 min. carousel
Case: 18k gold, polished, gold dome, case maker's punch mark "JW" (Joseph Walton), turnable pendant. Dial: enamel, off-white (Willis), radial Roman hours, auxiliary seconds, gold spade hands. Movm.: 4/5 plate movement, ébauche: Bahne Bonniksen, signed, gilt, screwed chatons, carousel with 52,5 minutes rotation time, gold screw compensation balance, freesprung blued balance spring, fine florally engraved balance cock.

Birch & Gaydon was originally established as a company by William Turner around 1760; Turner was a watchmaker working at 18 Cornhill in the City of London. In 1825 the business had been moved company to Fenchurch Street in London and by 1840 it was owned by watch manufacturer William Birch. When Henry Martin Gaydon became a partner around 1880, the company started trading under the name of Birch & Gaydon; when Birch retired, Gaydon became its sole partner. The business was at the time described as "chronometer makers, goldsmiths and jewellers at 172 Fenchurch Street". When the old premises were demolished in 1904, Birch & Gaydon moved to 153 Fenchurch Street.