The Islander Melville uses a Seiko NH34 movement. It has a normal hour and minute hand, which tell the time in a 12 hour format. It also has a separate GMT hand, that is a 24 hour hand, and it rotates once per day. The GMT hand is independently settable from the time, so it can track a second time zone. The Islander Melville is what is known as a "Caller GMT" or "Office GMT".
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