The Seiko 1E20-3B80 is a watch model based on the 1E20 movement.
Parts List
| RECN42SJ01 | crystal - crystal |
| RECN42SJ03 | crystal - crystal |
| RECN42SJ07 | crystal - crystal |
| 30M66TA1 | crown - crown |
| 0E140NA1S | case back gasket - case back gasket |
| B5554 | band - band |
| B5598 | band - band |
| C026BB | band - band |
| 1E203B8025 | others - case |
| 81181859 | others - bracelet fixing pipe |
| 82722860 | others - case ring |
| 81606479 | others - bracelet fixing pin |
| 1E203B80 | others - case back |
| 1E203B8025A | others - case |
| 1E203B8025B | others - case |
| 1E205B20XE14 | others - dial |
| 1E205B20XL14 | others - dial |
| 1E205B20XS14 | others - dial |
| 1E208 | others - machine code |
| 0351931 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 04V02DGM | others - minute hand |
| 04V02DGH | others - hour hand |
Caliber 1E20
