The Seiko 3B21-0BB0 is a watch model based on the 3B21 movement.
Parts List
| DA081JM | band - metal band |
| DA081JMLK | band - link |
| DA082JM | band - metal band |
| DA082JMLK | band - link |
| H01H11SA07T | clasp - clasp |
| Z110ZS | others - push pin (clasp and band) |
| DA082JMEP | others - endpiece |
| DA081JMEP | others - endpiece |
| 81190075 | others - bracelet fixing pipe |
| 81604629 | others - bracelet fixing pin |