Built on a Genuine Seiko MovementEvery watch is built around an authentic Seiko-manufactured NH34 GMT movement, the same movement used inside factory Seiko watches. Hand-assembled and tested before it ships. 30-Day Free ReturnsTry it for 30 days. If it's not right, send it back for a full refund. 12-Month Movement WarrantyIf the movement fails under normal use within 12 months, we'll repair or replace it, free. Specifications Movement: Genuine Seiko NH34 Automatic GMT, 24 jewels, 41-hour power reserve True dual-timezone GMT function — fourth hand independently adjustable Hacking seconds & hand-winding capable Case: 316L stainless steel, 40mm diameter, ~13mm thickness Screw-down crown for added water resistance Bezel: 120-click unidirectional ceramic bezel insert Crystal: Scratch-resistant sapphire crystal Bracelet: 316 stainless steel oyster-style with double-locking clasp Water Resistance: 100m / 330ft (pressure tested) Date window at 3 o'clock with cyclops magnifier Super-LumiNova lume on hands and indices Includes: Watch box, link removal tool, and spring bar tool Additional Features: On the go adjustments with the glide-lock clasp