The Patek Philippe Reference 3604 is a refined example of the brands elegant design language from the 1970s, embodying the eras bold geometry and minimalist sophistication. Introduced in the early part of that decade, the Ref. 3604 features a distinctive cushion-shaped case crafted in 18k yellow gold, housing the ultra-thin automatic Caliber 28-255 C the same celebrated movement found in the original Nautilus Ref. 3700. This particular example stands out for its rich blue starburst dial, which plays beautifully with light and complements the warmth of the gold case. The discreet date window at 3 oclock and applied gold indexes underscore Patek Philippes mastery of proportion and restraint.

This Patek Philippe Ref. 3604 is presented in excellent overall condition. The 18k yellow gold case retains its original proportions, with a crisp hallmark clearly visible on the side. The polished and brushed surfaces show minimal signs of wear consistent with careful use. The blue starburst dial is superb all original, clean, and free from blemishes or restoration. The applied gold markers and matching hands remain bright and intact, while the date aperture is crisp and legible. The sapphire crystal is clear and free from scratches. The watch is powered by Patek Philippes automatic Caliber 28-255 C, known for its slim profile and reliability. It is fitted with a black leather strap featuring the original Patek Philippe gold buckle.

Overall, this Ref. 3604 is an exceptional example of 1970s Patek Philippe design elegant, distinctive, and preserved in outstanding original condition.