The Seiko 1E20-3B90 is a watch model based on the 1E20 movement.
Parts List
| RE2A24JR02 | crystal - crystal |
| 6M35B2SAW1 | crown - crown |
| 0F150NA1S | case back gasket - case back gasket |
| D0X4AB | band - metal band |
| D0X1AB | band - band |
| 03V06ALH | others - hour hand |
| 2EA032A3BAL | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 1E203B907E | others - case |
| 82838340 | others - case ring |
| 1E203B90 | others - case back |
| 1E205B40XS39 | others - dial |
| 1E207 | others - machine code |
| 0351931 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1E20
