... back case.2. high quality automatic japan( seiko PC21S/seiko PC21J) movement & calendar &3 years battery life ;3. chronograph dial with ... mineral glass.4. 3ATM water resistant. 5. pass ROHS & CE certificate.6.original stainless steel back case, which ... 15days, mass productioin lead-time 55days; Materialstainless steel case with s.s band matetial, pass ROHS,CEBetteryoriginal battery,quality ...