The Seiko 5421-5090 is a watch model based on the 5421 movement.
Parts List
| SA7N34GN00 | crystal - crystal |
| 35N18NS1 | crown |
| 0H1720N01 | case back gasket - case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| HZ21A | band - band |
| 07SC02NG | others - second hand |
| 05T02NGH | others - hour hand |
| 05T02NGM | others - minute hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 0354706 | others - winding stem |
| 542150902N | others - case |
| 82705640 | others - case ring |
| 54210200XG14 | others - dial |
| 54210360XY14 | others - dial |
| 54211 | others - machine code |
Caliber 5421
