The Seiko Y520-5020 is a watch model based on the Y520 movement.
Parts List
| K02N66LN01 | crystal |
| 25M24NS1 | crown |
| 25M24NF1 | crown |
| 0H1200B01 | case back gasket |
| DZ72B | band - metal band |
| KZ90A | band - metal band |
| KZ91A | band - metal band |
| KZ92A | band - metal band |
| KZ94B | band - metal band |
| DZ73B | band - metal band |
| DZ74B | band - metal band |
| 04V04NAM | others - minute hand |
| 04V04NAH | others - hour hand |
| 04V42NGM | others - minute hand |
| 04V42NGH | others - hour hand |
| 04V42NSH | others - hour hand |
| 04V42NSM | others - minute hand |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 0351930 | others - winding stem |
| 04V40NGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04V40NGH | others - hour hand |
| 04V40NSH | others - hour hand |
| 04V40NSM | others - minute hand |