The Seiko 3421-5240 is a watch model based on the 3421 movement.
Parts List
| ES2N90GN00 | crystal - crystal |
| 30M22NS1 | crown - crown |
| 0Z1901N0A | case back gasket |
| 86177081 | crystal gasket - plastic gasket for crystal |
| 86177080 | crystal gasket - plastic gasket for crystal |
| DS09A | band - band |
| 08T02AKH | others - hour hand |
| 08T02AKM | others - minute hand |
| A100BS | others - push pin (for mb) |
| 34210580XE1L | others - dial |
| 34210580XL1L | others - dial |
| 34210580XS17 | others - dial |
| 34211 | others - machine code |
| 0354546 | others - winding stem |
| 342152407E | others - case |
| 83117330 | others - case ring |
| 342152407EA | others - case |
| 08SC14NS | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 08T02ASH | others - hour hand |
| 08T02ASM | others - minute hand |
Caliber 3421
