Marking:  crowned fleur-de-lis, 2 grains de remède, PMB, device a 5-pointed star (maker's mark);  calyx surrounded by fleurons (Paris charge mark for gold and small silver work, 1768–74);  crowned italic G (Paris warden's mark for gold, 1770–71);  helmeted head (Paris discharge mark for gold and small silver, 1768–75);  eagle's head in single outline (Paris restricted warranty mark for gold, 1838–47);  539 (possibly dealer's number).
Location of marks:
 -  inside bottom and cover,  also possibly inside back wall
,  on insetting rim of box,  also on outside edge of cover
 on insetting rim)