The Seiko 3421-0040 is a watch model based on the 3421 movement.
Parts List
| 190W04GN00 | crystal - crystal |
| 30M22NA1 | crown - crown |
| 30M22NS1 | crown - crown |
| FH1980B01 | case back gasket - case back gasket |
| 86178941 | crystal gasket - plastic gasket for crystal |
Caliber 3421
