The Seiko 9521-5210 is a watch model based on the 9521 movement.
Parts List
| ESCN24SN00 | crystal |
| 25M02NA4 | crown - crown |
| 25M02NS4 | crown - crown |
| 0H2520N01 | case back gasket - case back gasket |
| 81922821 | clasp - clasp |
| 81922829 | clasp - clasp |
| 12ST08CS | others - second hand |
| 12ST06DG | others - second hand |
| 0354855 | others - winding stem |
| 08X24DGH | others - hour hand |
| 82730340 | others - case ring |
| 95211 | others - machine code |
| 9521521011 | others - case |
| 9521521025 | others - case |
| 95215230XA15 | others - dial |
| 95215230XA25 | others - dial |
| 08X24DGM | others - minute hand |
| 08X24DSH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
| 08X24DSM | others - minute hand |