Rolex. A stainless steel manual wind chronograph bracelet watch Model: Oyster 'Monoblocco' Reference: 3525 Date: Circa 1940 Movement: 17-jewel manual wind Dial: Black gloss, applied luminous tipped gilt pointed baton hour markers, Arabic numeral 6 and 12, outer gilt 1/5th second divisions with Arabic numeral 5 minute markers, subsidiary dials at 3 and 9 for seconds and 30 minute recording, gilt hands with luminous inserts, centre chronograph hand Case: Brushed and polished round, screw down back, crown flanked by twin pushers, No.186144 Strap/Bracelet: US market stainless steel expandable riveted Oyster link Buckle/Clasp: Signed folding clasp stamped 1-65 Signed: Case, dial & movement Size: 35mm Footnotes: The reference 3525 was produced for a very limited time from 1939-1945. Despite the short production period it holds an important place in the Rolex history being the first chronograph of theirs to be placed in an Oyster case. The well known design behind the Oyster case has led this model to be nicknamed the 'Monoblocco' - implying as the name suggests that the case is made from one piece. For further information on this lot please visit Bonhams.com