Under the hood you will find an automatic, Japanese Miyota 90S5 (28800bph) movement. The glass is 4.5mm thick scratch resistant sapphire glass (with an AR coating). The impressive 500 meter water resistance of this watch is possible due to the helium valve, that you can see on the side of the case. The uni-directional 120 clicks bezel has a blue ceramic insert (which is very scratch resistant) and the watch comes with a very comfortable rubber strap with bronze buckle.

The most obvious perk of the watch is the material: it's entirely made from CuSn8 bronze. Bronze has the great attribute that it builds up a layer of patina. This is an ongoing process which makes every watch unique. Discolouration is normal with this material. One major benefit is that you can largely bring back your watch in the original condition by using a Cape Cod cloth.

The SMB531 is limited to just 100 pieces worldwide 

SeriousWatches is an authorised dealer of OceanX watches. This watch comes with a 2 year warranty, the OceanX box and the manual/warranty booklet. Worldwide shipping is free.