The Seiko 5B21-0AA0 is a watch model based on the 5B21 movement.
Parts List
| D249DG | band - band |
| DEY5AW | band - leather band |
| DEZ0AW | band - leather band |
| D249DG-LK00 | band - link |
| DEY5AW-BJ00 | clasp - buckle |
| DEZ0AW-BJ00 | clasp - buckle |
| D249DG-BK00 | clasp - clasp |
| D249DG-BKPP | others - spring bar for buckle/clasp |
| S200BS | others - push pin |
| D249DG-LKPC | others - pipe for link |
| D249DG-LKPN | others - pin for link |
Other models with the same movement
| 5B21-0AB0 |
| 5B21-0AC0 |
| 5B21-0AD0 |
| 5B21-0AE0 |
| 5B21-0AF0 |