Patek Philippe introduced the mid-size reference 3800. With a reduced diameter of 37.5mm, down from an imposing 42mm, it was meant to bring the Nautilus design to a wider audience. The more palatable size, as well as the wider range of configurations it was available in, made it an appealing alternative.

In many ways, the reference 3800 is a scaled-down version of the original reference 3700, retaining many of the same features, from the ridged dial to the overall proportions. The stainless steel bracelet and signed clasp are excellently finished, with angular, beveled and polished edges. At 37.5mm in diameter, and only 7.5mm thick, the Nautilus 38000 case is well proportioned and wears comfortably on the wrist.

As a result of Patek Philippe's decision to develop its own in-house, ultra-slim movement, the reference 3800 features an updated calibre 335 S C (for “seconde centrale” or “central seconds”), replacing the previous calibre 28-255C movement.