T1D1 – Model M010131 – Blue Ocean Edition. Automatic wind movement with 80 hours power reserve. Based on our T1D1 model series, this M010131 model comes with our 1st Blue IP coated stainless steel 316L case with BLACK deco screws and screw down crown. Like our traditional T1D1 series, you can have a choice of having the removeable outer case attached to the watch (45mm in width without crown), whereas you can also choose to have the outer case removed (size will become 40mm). This can be done without the needs of any supporting tool, meaning this modification can be done D.I.Y.