The Seiko 9721-8000 is a watch model based on the 9721 movement.
Parts List
| 290W31HN00 | crystal |
| 40M97NS1 | crown |
| 40M97NA1 | crown |
| FH3030B02 | case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
Caliber 9721
Other models with the same movement
| 9721-5000 |
| 9721-5020 |
| 9721-5030 |
| 9721-5040 |
| 9721-5050 |
| 9721-8009 |
| 9721-8010 |