Ca. Ø51.5mm, ca. 124g, 18K gold à-goutte, engine turned, London Hallmarks 1875, dome inscribed chronometer, exquisite pivoted detent chronometer movement, special spherical hairspring, gold wheel, screwed gold chatons, chain/fusee, signed enamel dial, craquelling under the seconds scale, gold hands, overall in good condition, very rare chronometer quality with extremely rare hairspring, in working order, with probably original key.