The Seakoss GMT is built around the genuine Seagull ST2557 — a true in-house GMT movement from the same manufacturer behind our Sea-Gull dress watch, but engineered here for a completely different purpose. Rather than a simple second-timezone sub-dial, the ST2557 features a central 24-hour hand that makes one full rotation per day, letting you track a second time zone at a glance alongside the normal hour and minute hands.
With 30 jewels and a 21,600vph beat rate, it offers a genuine 40-45 hour power reserve. The dial layout includes small running seconds and a date window, all set within a substantial 45mm, 316L stainless steel case with a screw-down crown and sapphire crystal. Rated to 100m water resistance, it's a genuinely capable everyday watch — comfortable for swimming and daily knocks, though not a certified dive watch in the ISO sense.
This is a real, functioning GMT complication at a price point where that's genuinely unusual — most affordable "GMT" watches use decorative sub-dials rather than a true independently-trackable 24-hour hand.
