The Seiko Y520-0020 is a watch model based on the Y520 movement.
Parts List
| 115N50LN01 | crystal |
| 25M24NS1 | crown |
| 25M24NF1 | crown |
| 0H1100B01 | case back gasket - case back gasket |
| KE70A | band - metal band |
| KZ79C | band - metal band |
| KE71A | band - metal band |
| KZ78C | band - metal band |
| 04V32DAM | others - minute hand |
| 04V32DAH | others - hour hand |
| T060AS | others - push pin |
| 0351930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 04V32DSH | others - hour hand |
| 04V32DSM | others - minute hand |