PATEK PHILIPPE CALATRAVA, REF.3509, A RARE STAINLESS STEEL WRISTWATCH, CIRCA 1965PATEK PHILIPPE | CALATRAVA, REF.3509, A RARE STAINLESS STEEL WRISTWATCH, CIRCA 1965Movement No: 1'147'815Case No: 2'657'338Calibre: 23-300, manual winding, signedDial: Silvered, signedCase: 33mm, stainless steel, screw down case back, signedStrap: Associated endangered species strap, associated stainless steel buckle百達翡麗，「Calatrava」3509型號，罕有精鋼手動上弦腕錶，年份約1965。