The Seiko W136-4A20 is a watch model based on the W136 movement.
Parts List
| FH3180B01 | case back gasket - case back gasket |
| F1Q7JB | band - band |
| W1364A2001 | others - case |
| W1364A2002 | others - case |
| S180BS | others - push pin |
Other models with the same movement
| W136-4A00 |