A gentleman's wristwatch of steel. Model Calatrava ref. 2509. Mechanical movement with manual winding. Silvered dial with whitegold hands and hourmarkers. Black Patek Philippe strap with C-buckle of steel. Case diameter app. 35 mm. Patek Philippe box and certificate included. 1960s.
The steel version of ref. 2509 is much rarer compared to both the yellow- and whitegold version of this reference.