Rolex Sigma Dial

The Rolex Sigma dial is one of those low-key, fascinating details that true collectors, like the team here at Tropical Watch, geek out about all the time. Introduced in the early 1970s, Sigma dials feature tiny Greek sigma letters at six o'clock, signaling the use of solid gold for the hour markers and hands. It's such a subtle touch, but wow, it adds a whole new layer of charm and collectibility to vintage Rolex pieces, and honestly, we can't get enough of it.