Ca. Ø46.5mm, ca. 79g, 18K gold, No.8825, both sides glazed, verge movement, face with decentral dial, underneath the regulation (small restoration in the enamel), back with enamel dial with date and indication of the day of the week from the centre, overall in very beautiful condition, intact. These watches are extremely rare. The invention is attributed to Jean-Antoine Lepine. Here 2 more examples: 1. (https:///go/abY), 2. (https:///go/dYa).