The ref. 3520 was launched in 1965 and at first was only available with a flat bezel. Starting in 1968 the ref. 3520D was part of the line (D for decoratif meaning decorated bezel). This example from 1978 features a manual caliber 177. For a watch with a big look and great value, this is the understatement that you have been looking for. Archive just received from Geneva confirming original production in 1978 and sale in 1979.
REF. 5116R-001
PATEK PHILIPPE PINK GOLD CALATRAVA WITH ENAMEL DIA…
Full Set Patek Philippe manual-winding 18K pink gold Calatrava, Sold in 2014
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