Ca. Ø51mm, ca. 76g, 18K gold, both sides with extremely rare enamel work with enamelled beaded rim, blue engine turned enamel on the back with finest paillon inlay, opening button in the pendant, dome withplete signature, Gregson watchmaker to the king, No.3017, tiny opening pin for the dome, underneath the rare calibre with virgule escapement, signed dial in very good condition, possibly original gold hands, in working order and extremely well preserved, only a small area of the pearl decoration is minimally damaged. The watches with the probably original key. Jean-Pierre Gregson originally came from England. In 1776 he became royal court watchmaker in Paris. His important position is also shown by the fact that in 1786 he was appointed as a member of amission to found a royal manufactory. The other members were the most famous watchmakers in France: Breguet, Berthoud and Lepaute. He was one of the first watchmakers of his time to use Lépine's bridge calibres at an early stage. Gregson enamel watches are among the most sought-after pieces in this field of collecting! Especially the movement version presented here is of museum collector's value!