The Seiko 1E20-0D40 is a watch model based on the 1E20 movement.
Parts List
| 135N23SV01 | crystal |
| 27M05DE1 | crown |
| 0E125BA11 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| 81608279 | band - other |
| 82731250 | others - case ring |
| 81609251 | others - pin |
| 1E200D4043 | others - case |
| 1E200D70XS19 | others - dial |
| 1E208 | others - machine code |
| 0351931 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 04L07VHH | others - hour hand |
| 04V07CGM | others - minute hand |
| 1CA027A3BAA | others - hour hand |
| 81332615 | others - button spring |
| 2EA040A3BCA | others - minute hand |
Caliber 1E20
