Squale Watch Sub-39 GMT Vintage SUB-39GMTV. In homage to Squales glorious past, the Squale watches Sub-39 series evokes a model produced by Squale in the late 50s. At that time Von Buren, the brands founder, was designing and manufacturing watchcases for the most popular brands in the watch industry. Squale has further enriched the Sub-39 collection with the introduction of the new GMT model offering all the essential functions of the evermore universal diver. The Sub-39 GMT Vintage is the ideal travel companion for divers who want to explore their passion for diving all over the planet. A practical tool watch at its core, it allows the wearer to enjoy two distinct function-viewing multiple time zones and calculating immersion times on a dive-without ever having to switch watches.