This is a ADANAC navigator style watch, made by Marathon using a Gallet case in 1990. It’s got all the things you'd expect in a military watch made in 1990 - fixed lug bars, bi-directional 60 click bezel, slim case but rock solid with 200M WR. The extra treat is somebody along the way converted it with an ETA automatic movement (seller included the original quartz movt and handset if you want to reverse the move). Its keeping + 3 seconds a day on my wrist, too. Its in very good condition for a 1990 watch, and has that nice vintage vibe of a military contract piece.
Slim compared to modern versions like the steel Navigator.
Asking $700 OBO.