The Seiko 3Y09-0B20 is a watch model based on the 3Y09 movement.
Parts List
| 210W20HN01 | crystal |
| 210W20HN | crystal |
| 30MB6NA1 | crown |
| 0A2000B01 | case back gasket |
| EZ0035B0 | case back gasket |
| G5138G | band |
| G5138G-LKG | band - link |
| G5138G-BK4G | clasp - clasp |
| 0351546 | others - winding stem |
| 0801778 | others - date dial |
| 0801812 | others - date dial |
| 3Y090B20 | others - case back |
| 3Y090B2075 | others - case |
| 3Y090C80XG14 | others - dial |
| 3Y090C80XS14 | others - dial |
| 3Y099 | others - machine code |
| 82810460 | others - case ring |
| A120AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 09TC6NAM | others - minute hand |
| 09TC6NAH | others - hour hand |