Signed on dial case and movement. DIAM. 35 mm. THICKNESS 9.5 mm. Successor to the Patek 2526 the Patek 3428 is similar in all points except that it was equipped with the new generation of automatic movements caliber 27-460. Featuring the same case size and of course the all important enamel dial this reference is the development of the first ever automatic wristwatch ever made by PATEK PHILIPPE. Made only during a period of 5 years from 1960 to 1965 this is only the 5th white gold reference 3428 to appear on the market. Never offered at auction before with a perfect enamel dial and its original crown and cased in white gold it is undoubtedly one of the nicest waterproof automatic Patek ever produced.