The Seiko 3Y09-0020 is a watch model based on the 3Y09 movement.
Parts List
| 180N85JU | crystal |
| 180N85JU01 | crystal |
| 40MY7NN1 | crown |
| 0G1890B02 | case back gasket - case back gasket |
| DZ0040B0 | case back gasket |
| 0G1890B0 | case back gasket |
| WKJ14G | band - leather band |
| WKZ09G | band - leather band |
| 07T51AGH | others - hour hand |
| 07T51CGM | others - minute hand |
| 07T51XAH | others - hour hand |
| 07T51ZAM | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 81606511 | others - bracelet fixing pin |
| 81607999 | others - bracelet fixing pin |
| 81180249 | others - bracelet fixing pipe |
| 81181919 | others - bracelet fixing pipe |
| 82830130 | others - case ring |
| 3Y090020 | others - case back |
| 3Y0900202G | others - case |
| 3Y090020J9 | others - case |
| 3Y090050XS14 | others - dial |
| 3Y090050XS34 | others - dial |
| 3Y099 | others - machine code |