• cal. 177 nickel lever movement, 18 jewels, free-sprung Gyromax balance, mono-metallic balance • white dial, Roman numerals • 18k yellow gold case, hobnail bezel, screw back • case, dial and movement signed • with an 18k yellow gold Patek Philippe buckle
With an Extract from the Archives confirming production with Roman numerals in 1993 and sale on September 16th, 1993.
When this model, Ref. 3520, was first released in 1965, Patek Philippe advertised it as 'the flattest waterproof watch in the world.' The 'D' in the reference number is short for 'décor' and refers to the clous de Paris, or hobnail-patterned,bezel.
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