The Seiko 1E20-2100 is a watch model based on the 1E20 movement.
Parts List
| 130A02SN01 | crystal - crystal (sapphire) |
| 25M69NA1 | crown |
| 0F110BA1S | case back gasket - case back gasket |
| XX000 | band - band |
| 1CA032A3BNG | others - hour hand |
| 2EA047A3BDG | others - minute hand |
| 82872130 | others - case ring |
| 1E20210076A | others - case |
| 1E202100 | others - case back |
| 1E205240XS19 | others - dial |
| 1E208 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 0351931 | others - winding stem |
Caliber 1E20
