The OceanX Sharkmaster GMT Automatic SMS-GMT-521. Is a high quality watch.
It pays tribute to diving watches of the present and the past, but does have key OceanX elements. Under the hood you will find an automatic, Japanese Seiko NH34 movement, which has a GMT complication. The glass is scratch resistant sapphire glass. The uni-directional bezel has a 24 hour scale and ceramic insert.