Pre-owned Patek Philippe Nautilus ref 3900-1J-010 is one of the more unusual and harder-to-find variations within the Nautilus family. First introduced in 1976 and designed by Gérald Genta, the Nautilus helped define the idea of a luxury sports watch, with its distinctive rounded octagonal bezel, horizontally embossed dial, and integrated bracelet. Those design cues are all here, just in a more compact 32mm “boy’s size” format that sits right between traditional men’s and ladies’ models. This example is crafted in yellow gold with a black dial. It also features a Sigma dial, indicating the use of gold for the hour markers and hands, along with a date at 3 o’clock for everyday practicality. Produced in relatively small numbers, the ref 3900 has become a bit of a niche collector’s item, appealing to those who appreciate the Nautilus design in a more compact, less common execution. Shop Patek Philippe Nautilus Collection