The Patek Philippe Calatrava reference 3919, introduced in 1985, is a round dress watch of about 33 mm in 18 kt gold, with a hobnail (“clous de Paris”) bezel, a sapphire crystal and a sapphire case back. It runs the hand-wound calibre 215 PS, with a small seconds at six o’clock and a power reserve of about 44 hours. It was made mostly in yellow gold, with white gold and other variants, and in several dial styles.

The hobnail bezel and clean dial took their lead from the original Bauhaus-inspired Calatrava of 1932, and the 3919 became the standard Calatrava of its generation. It stayed in the catalogue for about two decades before being replaced by the 5119 in 2006.

Collectors prize the 3919 as an understated and well-proportioned dress watch, and it is often recommended as a first vintage Patek because of its simple movement. The reference is no longer in production, although the Calatrava line continues.