The Seiko 1E20-3031 is a watch model based on the 1E20 movement.
Parts List
| K01A39JN02 | crystal - crystal |
| 25M69NA1 | crown |
| 0F110BAA1 | case back gasket - case back gasket |
| W018BG | band - band |
| 04R05NGM | others - minute hand |
| 1DA027A3BNG | others - hour hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351931 | others - winding stem |
| 1E20303176A | others - case |
| 1E203031 | others - case back |
| 1E205120XS14 | others - dial |
| 1E208 | others - machine code |
| 82825930 | others - case ring |
| 04R05NGH | others - sub hand |
Caliber 1E20
