When it comes to pilot’s or tactical watches, the mind often leaps to IWC’s iconic Big Pilot or Casio G-Shock’s impressive lineup of aviation and survival-inspired timepieces. But, in the world of watches designed for the adventurous, IWC and Casio are far from the sole contenders, catering to pilots, underwater explorers, and desk divers alike.

Since their founding in 1961, Sinn have become synonymous with highly functional watches capable of meeting special demands. And, thanks to a direct sales business model, the manufacturer’s sophisticated timepieces remain affordable, so it’s no wonder that the German brand is so popular with watch enthusiasts. In this article, I’ll be telling you more about their history and showing you three of their most popular models.