Seiko 6105-8110 SERIAL No. 681832 MANUFACTURE DATE Aug 1976 SPECIFICATION The cal. 6105B movement has 17J, runs at 21,600 bph, is hacking and has a quickset date calendar mechanism. The 6105-8810 case is a large asymmetrical cushion design with a bi-directional rotating 60-click bezel. ADDITIONAL LINKS Seiko Divers Reference Seiko Forum designed by: