Patek Philippe, Gübelin Retailed By Gübelin: Calatrava Reference 3520/10, A Yellow Gold Mechanical Wristwatch with Integrated Bracelet, Circa 1969

Bearing the signatures of Patek Philippe and iconic Swiss retailer Gübelin, this Reference 3520/10 is crafted from yellow gold with an integrated metal mesh bracelet and complemented by a brushed champagne dial. Fitted with the watchmaker's free-sprung Gyromax balance, the caliber 175 inside this Calatrava offered superior accuracy among competing ultra-thin watches in the 1960s and 1970s. The present timepiece not only possesses a rich history, but also looks great on slimmer wrists for formal occasions.