Seiko has been focusing on incorporating GMT complications into their entry-level products, with the Seiko 5 sports line introducing a GMT movement last year. The Prospex line already has models with a fourth hand for time zone changes. In a continued push to expand the GMT offerings, Seiko recently announced the Prospex Solar Sumo GMT Divers. 

This collection brings forward a new dial with a new 24hr track showcasing the GMT functionality of the watch. While a subtle wave texture on the dial as well as a large diving bezel instantly reminds you that this watch still has diving capabilities. The case, affectionately called the Sumo, has a super-hard coating and measures 45mm in width and 13.2mm in thickness. Water resistance is a dive-ready 200 meters. All this secured to your wrist with a durable steel bracelet with a locking three-fold clasp and a dive extension.  

For the Prospex Solar Sumo GMT Divers, Seiko uses the 5K65 solar quartz movement which has an independently adjustable 12-hour hand and a date function. Which means the watch is considered a "True" or "Flyer" GMT. In terms of specifications, the movement is rated for +/- 15 seconds per month and contains 3 jewels.

Although using a solar quartz movement instead of a mechanical movement may take some getting used to, it offers the convenience of better time keeping and eliminates the need to frequently opening up a dive watch to change batteries.