Ca. Ø53.5mm, ca. 110g, 18K pink gold, engine turned, French gold punches and maker's mark PHP and case number 2100, signed dome, early, very interesting calibre, cylinder escapement, musical movement, automatic release on the hour and additionally on demand, engine turned dial, Breguet steel hands, in working order. This particular calibre is one of the earliest pocket watches with a musical movement.