Ca. Ø47mm, ca. 51g, 18K gold, super thin case, similar to the Cartier 'Montre Couteau', both sides with white enamel rims and green engine turned enamel, back with fantastically painted horse motif, numbered 16832/5420, precision movement with screwed chatons, engine turned dial, silver numeral ring, silver vendor's cartouche Chiswell Buenos Aires, blued steel hands, very well preserved, in this quality an absolute rarity, in working order. There is a 2nd known example of Ref. 5420 with matching motif (No.16823), auctioned for 6.250US in New York 2012 (https:///go/0N5).