A Louis XVI poudre d'ecaille and gold mounted portrait box

A Louis XVI poudre d'ecaille and gold mounted portrait box, the miniature by Guiseppe Tresca, signed and dated 1783, the gold mounts by Louis-Jean Glaton, with the charge and discharge marks of Henri Clavel, Paris 1783, the circular blue poudre d'ecaille cover with inlaid gold stud-work, with wirework mounts, the underside unscrews to reveal a portrait miniature on ivory of a lady in a blue and pink dress with a white shawl holding a bunch of pink roses, under glass with a gold frame with a blue enamel frame and motto 'HONNI. SOIT. QUI. MAL.Y. PENSE. AMITIE. PARFAITE' , gold lined interior, in a later fitted Harvey and Gore case, diameter 8cm.