The Seiko 3421-0120 is a watch model based on the 3421 movement.
Parts List
| 230W04GA00 | crystal - crystal |
| 35M78NS1 | crown - crown |
| FH2380B0A | case back gasket - case back gasket |
| 86560540 | crystal gasket - plastic gasket for crystal |
| 86560560 | bezel gasket - plastic gasket for bezel |
| DA11A | band - band |
| 08T08ESH | others - hour hand |
| 08T08ESM | others - minute hand |
| 0354546 | others - winding stem |
| 34210120SC | others - case |
| 82330223 | others - bezel |
| 82360160 | others - bezel |
| 83118370 | others - case ring |
| 0884890 | others - holding ring for dial |
| 34210700XB1L | others - dial |
| 34211 | others - machine code |
| 84300260 | others - dial ring |
| A140BS | others - push pin |
| 08SC14NS | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 3421
