The Seiko 1E20-2120 is a watch model based on the 1E20 movement.
Parts List
| 6M30C7NMG1 | crown - crown |
| 6M30C7NMW1 | crown - crown |
| 0D115BA11 | case back gasket |
| XX000 | band - band |
| 1CH032A1BAA | others - hour hand |
| 1E2021203WA | others - case |
| 82813850 | others - case ring |
| D20040B01 | others - crown and stem gasket |
| 1E20212043A | others - case |
| 1E202120 | others - case back |
| 1E20212045A | others - case |
| 1E205250XA14 | others - dial |
| 1E208 | others - machine code |
| 0351931 | others - winding stem |
Caliber 1E20
