Patek Philippe Calatrava 3520

Patek Philippe Calatrava 3520D Hobnail Bezel 18k YG Retailed by Tiffany & Co.

The Calatrava has long been heralded as one of watchmaking’s most iconic watches. First produced in 1932 and now over 90 years old, it has gone through several changes over the decades. Perhaps one of the most surprising of those changes was in 1965 when Patek launched the ref. 3520 that we have here. Heralded as the thinnest waterproof watch, the ref. 3520 features a screw-down caseback with caseback tool indents that reveal its rather innocuous secret. Produced for almost 25 years, the ref. 3520 saw two variants across four metals, yellow, pink, white gold, and platinum. The first series ref. 3520 was fitted with the cal. 175 movement, which was based on a movement design by Piguet. In 1977, Patek Philippe began using the Geneva-sealed cal. 177 movement in the second series of ref. 3520 watches, which is what powers our example here. In 1968, Patek Philippe introduced the ref. 3520D as a braceleted version of the ref. 3520. This model continued to be produced for an extremely long time, until it was finally discontinued in 2008. Despite its age, the ref. 3520 remains a highly sought-after watch among collectors and enthusiasts. Its unique design and technical excellence make it a true classic in the world of horology, and a rather interesting reference from within the iconic Calatrava family. Brand : Patek Philippe Dimensions : 32mm Model : Calatrava Movement : Manual-wind cal. 177 Reference : 3520 Bracelet : Leather strap Year : 1991 Condition : Very good Material : 18kt yellow gold Included : Watch and Extract from the Archives Dial Color : White THE DIAL Boasting a bright white dial with black Roman numerals, the dial of this ref. 3520 is wonderfully classical in its execution. Featuring the co-signature of Patek's most-esteemed retailer, Tiffany & Co., this example is a collector's delight. THE CASEBACK While the Calatrava is indeed a dress watch, Patek intended for the ref. 3520 to be the world's thinnest waterproof watch, and so it features a screw-down caseback with six indents for a caseback tool. TIMING MACHINE READOUT This reading was taken (crown down) with a ONEOF Accuracy Boutique Edition timing machine at time of cataloging. It is provided as a courtesy only, and shall not be construed as a warranty or guarantee of any kind. Please refer to our terms and conditions of sale for more information.