The Seiko 9721-5040 is a watch model based on the 9721 movement.
Parts List
| ES4N69SN00 | crystal |
| 35N93NA1 | crown |
| 0H2550B01 | case back gasket |
| DH0070B01 | case back gasket - crown and stem gasket |
Caliber 9721
Other models with the same movement
| 9721-5000 |
| 9721-5020 |
| 9721-5030 |
| 9721-5050 |
| 9721-8000 |
| 9721-8009 |
| 9721-8010 |