Lépine. A very fine and rare 18K gold, enamel and pearl-set openface cylinder watch with wolf's tooth train and unusual dialSigned Lépine, inv. et fecit, Horloger du Roi, Paris, No. 5659, circa 1789Lépine calibre gilt-finished cylinder movement with free standing barrel, wolf's tooth winding, gilt cuvette, white enamel dial, mixed Roman and Arabic numerals, outer decorative line and red Arabic quarter hours, gold interlaced hands, circular case, pearl-set bezel, rim, bow and pendant, hinged back decorated with translucent green enamel over engine-turned background, centred by a gold paillon framed, finely painted enamel miniature depicting Erato and a putto in a classical landscape, case stamped with casemaker's initials GM for Guillaume Mermillod, dial and cuvette signed50 mm. diam.