The Seiko 1E20-0420 is a watch model based on the 1E20 movement.
Parts List
| 110N02JN01 | crystal |
| 30M68NA1 | crown - crown |
| 0H1100N01 | case back gasket |
| HZ40A | band - metal band |
| 04V10DGM | others - minute hand |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82723580 | others - case ring |
| 1E20042025 | others - case |
| 1E201270XG14 | others - dial |
| 1E208 | others - machine code |
| 0351931 | others - winding stem |
| 0354930 | others - winding stem |
| 04V10NGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
