Wristwatch: extremely rare Cartier steel chronograph with black dial and double signature Cartier & Ebel, Cartier box, probably 1937: Ca. Ø32mm, stainless steel, back with serial number 21006 and 37 (probably year of manufacture), manual winding, chronograph with rectangular pushers, black dial with telemeter scale, signed Ebel and Cartier, gold hands, like new leather strap, in very good condition, in working order, extremely rare. A comparable chronograph, also with black dial and double signature Ebel & Cartier, is described and illustrated in Paul White 'I Chronografi da Polso'.