Reference: 3520Movement No: 1'163'922Case No: 2'690'320Year: 1970Calibre: 175, manual windingDial: Blue, applied baton numerals, signedCase: 32mm, 18k yellow gold, solid screw case back, signedStrap: Leather, 18k yellow gold buckle, signedAccompaniments: Extract from the Archives confirming date of manufacture in 1970 and original date of purchase on 21st July 1970