PATEK PHILIPPE CALATRAVA. REF 2509 R. CIRCA 1950-1955. Bracelet watch in 18k pink gold called the "Grande Calatrava Waterproof". CASE: round, water-resistant screw-down caseback, inside caseback stamped twice: maker's key no. 11 and F.B. hallmark for Frères Borgel (Taubert having bought Frères Borgel in 1924) and inscription 'Patent' for water-resistance patent under the maker's hallmark. DIAL: silvered, applied 'épi' and 'dague' hour-markers, circular-grained minute track, small seconds at 6 o'clock and dauphine hands. MOVEMENT: mechanical, decorated with faux cotes, double hallmark of Geneva, 18 jewels, cal. 12-400 PS, N° 723.451. STRAP: leather with attached pin buckle. Dial, case and movement signed. Numbered 681.107. DIAMETER 35 mm Condition of the case: micro-scratches and scratches, small bumps, slight dents on the case back. Dial: lighter halo on the right side. Condition report on request. Condition report on request. A 18K pink gold manual winding wristwatch by Patek Philippe circa 1950-1955. Micro scratches from use on the case, slight dents on the back case. Light aureole on the right corner of the dial.