Built by the world renowned Seiko Group, our NH35 Automatic Movement is a reliable and accurate time keeping choice. The NH35 is both hacking and self-winding with a power reserve of 41 hours. For full power reserve Seiko suggests winding the crown 55 times. The NH35 has 24 jewels and a -20 seconds to +40 seconds per day accuracy. CASE MEASUREMENTSDiameter 41mm, thickness 15mm (including double domed glass 16mm), lug to lug 49mm, lug width 20mm CASE EXECUTIONBrushed case, aluminium rotating bezel, laser engraved caseback ring and open exhibition glass caseback GLASSDouble domed sapphire crystal finished with a medium blue tint and double sided anti-reflective coating DIALMatte curved sandwich dial with cut-out indices, green Super-Lumi Nova sub-layer, 3pm date window, polished hands and fire bell chime inspired seconds marker. CROWNStainless steel crown with a brass inset made from a 100 year old British brass firefighter's helmet STRAPSAll straps have a 20mm lug distance and a quick r