The Seiko 3B21-0BA0 is a watch model based on the 3B21 movement.
Parts List
| DA2Z1JMLK | band - link |
| DA2Z1JM | band - metal band |
| H12F12SA03G | clasp - clasp |
| S130BS | others - push pin |
| Z100ZS | others - push pin (clasp and band) |
| 81190075 | others - bracelet fixing pipe |
| 81190875 | others - bracelet fixing pipe |
| 81607579 | others - bracelet fixing pin |
| 81606899 | others - bracelet fixing pin |
| DA2Z1JMEP | others - endpiece |