The Seiko 7N21-0AA0 is a watch model based on the 7N21 movement.
Parts List
| 330P01LN03 | crystal - crystal (inorganic) |
| 8Z55M0NNW1 | crown - crown |
| 86579420 | crystal gasket - plastic gasket for crystal |
| F0H8JB | band - band |
| 0351880 | others - winding stem |
| 81190075 | others - bracelet fixing pipe |
| 81606899 | others - bracelet fixing pin |
| 7N210AA001C | others - case |
Other models with the same movement
| 7N21-0010 |
| 7N21-0020 |
| 7N21-0030 |
| 7N21-0040 |
| 7N21-0A00 |
| 7N21-0A10 |
| 7N21-0A30 |
| 7N21-0AC0 |
| 7N21-8A00 |
| 7N21-8A20 |
| 7N21-HAA0 |