The Calatrava is one of the most refined wristwatches—if not the most refined wristwatch—and when paired with a nice leather strap, vintage yellow-gold models such as this reference 3440J become wonderfully casual for everyday wear. Introduced in 1961, it is notable for its water-resistant, screw-down case back, an uncommon feature for the time. It is estimated that only around 50 examples of this reference were produced. The 35 mm 18k yellow-gold case is in nice condition and features a distinctive hexagonal screw-down case back and unusual lugs . While the case may appear understated when viewed from the front, the Calatrava truly comes alive in profile, thanks to the three distinct angles elegantly cut into the downward-turning lugs. The dial is silvered and has aged to a soft cream tone, with lovely raised enamel Patek Philippe lettering. Typical for this reference, it features three vertically aligned applied markers at 12 o’clock, a “dot-dot” minute track, and a running seconds subdial on the lower half. It is fitted with fine, non-lumed stick hands and paired with a lovely leather strap, which we think is a perfect match. This elegant Calatrava is powered by the automatic Caliber 27-460 and has been fully serviced by our watchmaker, the setting crown has been replaced at this service. Our love for these fine Calatravas runs deep—let’s get in touch to talk!! Specifications Patek Philippe Calatrava Reference 35mm 18k yellow gold case with screw down case back Silver dial with applied stick markers stick-hands, hard enamel signature Comes on the photographed leather strap Caliber 27-460 automatic Case number 312617, movement number 1111xxxx , dating to the first half of the 1960’s Fully serviced by our watchmaker One-year mechanical warranty Free worldwide FedEx Priority shipping