Ca. 18 x 34mm, 18K gold, serial number 26331/12037, original case with front slide/slider, underneath the concealed dial, backwinder, manual winding calibre Le Coultre, signed silvered dial, lacquered steel hands, leather strap with 18K felt clasp with French gold punch, master's punch EJ and No. 21576, later original Cartier leather box, absolute rarity. A matching watch is shown on a Hermes advertising brochure under the name 'Grisite Duoplan', price at that time 1,075 Francs.