The Seiko Y520-0B40 is a watch model based on the Y520 movement.
Parts List
| 120W50JK01 | crystal - crystal |
| 30ML2NS1 | crown - crown |
| 30ML2NF1 | crown - crown |
| 0E110NA1S | case back gasket - case back gasket |
| F0Z5BB | band - band |
| F0Z6AB | band - band |
| 04VC4NGH | others - hour hand |
| 04VC4NGM | others - minute hand |
| 04VC4NSH | others - hour hand |
| 04VC4NSM | others - minute hand |
| 0351930 | others - winding stem |
| 82725880 | others - case ring |
| Y5200B4079 | others - case |
| Y5200B407S | others - case |
| T060BS | others - push pin |
| Y5200 | others - machine code |
| Y5200D70XB13 | others - dial |
| Y5200D70XS34 | others - dial |
| EZ0035B01 | others - crown and stem gasket |