Swiss gold plated, keywind, jump hour, cylinder pocket watch by Courvoisier Freres (Swiss 1842-1882), 48 mm slim case with engine-turning. Gilt inner dust cover engraved 'Echappement a Cylindre, Quatre Trous en Rubis, No.26229, Courvoisier Freres'. Machine engraved 'Clous de Paris' guilloche surfaced silver dial, with digital jump hour aperture, above an eccentrically positioned minutes chapter with Arabic numerals at the quarters, gold Breguet hand, sunken subsidiary seconds dial at 30.