The Seiko 5B21-0AB0 is a watch model based on the 5B21 movement.
Parts List
| D251DZ | band - band |
| D251DZ-LK00 | band - link |
| D251DZ-BK00 | clasp - clasp |
| D251DZ-BKPP | others - spring bar for buckle/clasp |
| D251DZ-EP00 | others - endpiece |
| D251DZ-LKPN | others - pin for link |
| S190BS | others - push pin |
Other models with the same movement
| 5B21-0AA0 |
| 5B21-0AC0 |
| 5B21-0AD0 |
| 5B21-0AE0 |
| 5B21-0AF0 |