Patek Philippe is known for its range of complications, grand complications, and rare handcrafts. Among those horological heavy hitters lives a lesser-known Calatrava reference: the ultra-thin, hand-engraved 5180/1G Calatrava Skeleton. Simple in execution, a two-hand watch might not seem like much to write home about, but the 5180/1G has all the panache of a complicated...