The Seiko 8Y21-5030 is a watch model based on the 8Y21 movement.
Parts List
| BA6N93JV01 | crystal |
| BA6N93JV02 | crystal |
| 35NJ7NN1 | crown |
| 0H2600B01 | case back gasket - case back gasket |
| G1382G | band |
| 3BA125F1BNG | others - second hand |
| DA007BA11 | others - crown and stem gasket |
| 0351112 | others - winding stem |
| 08SC29NG | others - second hand |
| 08PE1NGM | others - minute hand |
| 08PE1NGH | others - hour hand |
| BA6N93JV01 | crystal |
| BA6N93JV02 | crystal |
| 35NJ7NN1 | crown |
| 0H2600B01 | case back gasket - case back gasket |
| G1382G | band |
| 3BA125F1BNG | others - second hand |
| DA007BA11 | others - crown and stem gasket |
| 0351112 | others - winding stem |
| 08SC29NG | others - second hand |
| 08PE1NGM | others - minute hand |
| 08PE1NGH | others - hour hand |
Caliber 8Y21
