The Seiko 5421-5240 is a watch model based on the 5421 movement.
Parts List
| ES7N14GN00 | crystal - crystal |
| 35M94NA1 | crown |
| 0G1700N01 | case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| PK04B | band - band |
| PK03B | band - band |
| 07T04DGM | others - minute hand |
| 07SC02NG | others - second hand |
| 5421524025 | others - case |
| 82707640 | others - case ring |
| 0354705 | others - winding stem |
| 54210530XB14 | others - dial |
| 54210530XG14 | others - dial |
| 54211 | others - machine code |
| A100AS | others - push pin |
| 07T04N1H | others - hour hand |
Caliber 5421
