The Seiko 1E20-3C90 is a watch model based on the 1E20 movement.
Parts List
| ES1A38JB0E | crystal - crystal |
| 30M82NS1 | crown - crown |
| 0E190BA1S | case back gasket - case back gasket |
| C042AB | band - band |
| C042AB-LK3 | band - link |
| C042AB-BKL | clasp - buckle |
| C042AB-PB2 | clasp - parts for buckle |
| 04V22DSH | others - hour hand |
| 04V22DSM | others - minute hand |
| 0351931 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82837860 | others - case ring |
| 1E203C902E | others - case |
| 1E203C90 | others - case back |
| 1E205D10XS13 | others - dial |
| 1E207 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1E20
