Seiko Saturday with the SNA411 "Flightmaster" . A beautiful homage to the days past when pilots relied on E6B flight computers and slide rules instead of modern GPS and flight computers.
Chronograph, alarm that can be used as a dual time, slide rule bezel for unit conversations, arithmetic and much more. Screw down crowns and pushers with a 200m water resistance. An incredible tool watch for any aviation or engineering geek.