The Seiko 1E20-3B00 is a watch model based on the 1E20 movement.
Parts List
| RE1A42JR02 | crystal - crystal |
| 40M96NB1 | crown - crown |
| 40M96NJ1 | crown - crown |
| 0F120NA1S | case back gasket |
| D0K9AZ | band - band |
| D0K9FZ | band - band |
| 02V04NGH | others - hour hand |
| 02V04NSH | others - hour hand |
| 03V28NGM | others - minute hand |
| 03V28NSM | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 82722120 | others - case ring |
| 81190055 | others - bracelet fixing pipe |
| 1E203B0075 | others - case |
| 1E203B00 | others - case back |
| 1E203B007E | others - case |
| 1E205A60XB13 | others - dial |
| 1E205A60XS14 | others - dial |
| 1E207 | others - machine code |
| 0351931 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1E20
