Seiko 3F31-0A00 Watch Guide The Seiko 3F31-0A00 is a watch model based on the 3F31 movement.Other models with the same movement3F31-00103F31-00203F31-00303F31-00403F31-004A3F31-0A103F31-0A203F31-0A303F31-0A403F31-0A603F31-0A703F31-0A903F31-0B003F31-0B103F31-0B203F31-0B303F31-0B403F31-0B503F31-0B603F31-0B703F31-0B803F31-0B903F31-0C003F31-0C203F31-0C303F31-0C403F31-50003F31-50103F31-50203F31-5A003F31-5A103F31-5A203F31-5A30