The Seiko 5S21-7A30 is a watch model based on the 5S21 movement.
Parts List
| 280WB8SV02 | crystal |
| 35MK4NS2 | crown |
| 0A2600B01 | case back gasket |
| GK53B | band - leather band |
| 12T08APM | hand - minute hand |
| 5S217A20XS1Z | others - dial |
| 5S217A30 | others - case back |
| 5S217A307E | others - case |
| 5S219 | others - machine code |
| A170BS | others - push pin |
| 0351683 | others - winding stem |
| 82803220 | others - case ring |
| 12T08APH | others - hour hand |
| 12SC32TL | others - second hand |
Caliber 5S21
