The Seiko 3B21-0AX0 is a watch model based on the 3B21 movement.
Parts List
| D376AZ | band - band |
| D376AZ-LK00 | band - link |
| D376AZ-BK00 | clasp - clasp |
| 81606439 | others - bracelet fixing pin |
| 81190875 | others - bracelet fixing pipe |
| D376AZ-LKPN | others - pin for link |