The Seiko 5421-0090 is a watch model based on the 5421 movement.
Parts List
| 210W12GN00 | crystal - crystal |
| 35MA8NS1 | crown |
| 35MA8NA1 | crown |
| 0A1900N01 | case back gasket - case back gasket |
| 86564280 | crystal gasket - plastic gasket for crystal |
| ML23A | band - band |
| ML24A | band - band |
| ML25A | band - band |
| 08SC12NG | others - second hand |
| 08SC12NS | others - second hand |
| 09T04A1H | others - hour hand |
| 09T04ASH | others - hour hand |
| 09T18AGM | others - minute hand |
| 09T18ASM | others - minute hand |
| A120BS | others - push pin (for lb) |
| 54210450XG18 | others - dial |
| 54210460XS19 | others - dial |
| 54211 | others - machine code |
| 0354705 | others - winding stem |
| 82706040 | others - case ring |
| 5421009075 | others - case |
| 542100907E | others - case |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 5421
