The Ball Engineer II Moon Calendar 40mm watch model # NM3016C-S1J-GR features: stainless steel case, brushed & polished stainless steel strap with a folding clasp / buckle. It has a green dial, fixed bezel. The case size is 40mm. This automatic watch is powered by the caliber BALL RR1807 is a 28800 VPH movement and has a power reserve of 38 hours . The Ball NM3016C-S1J-GR uses a sapphire crystal and has a water resistance of 100m/330ft.