The Seiko Y520-5A20 is a watch model based on the Y520 movement.
Parts List
| SA0A78LV0C | crystal - crystal |
| 25M18NS1 | crown - crown |
| 25M18NF1 | crown |
| 0E140NA1S | case back gasket - case back gasket |
| F089AQ | band - band |
| F089CQ | band - band |
| 04V42NGM | others - minute hand |
| 04V42NGH | others - hour hand |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 0351930 | others - winding stem |
| Y5205A2079 | others - case |
| 82738000 | others - case ring |
| Y5205A2079A | others - case |
| EZ0035B01 | others - crown and stem gasket |
| 04V04NCH | others - hour hand |
| 04V04NCM | others - minute hand |