The Seiko Y520-0100 is a watch model based on the Y520 movement.
Parts List
| 110N02LN | crystal |
| 110N02LN01 | crystal - crystal (inorganic) |
| 25E50NF1 | crown |
| 718BC | band - metal band |
| 718BC-LKG | band - link |
| 722BC | band - metal band |
| 724BC-LKG | band - link |
| 722BC-LKG | band - link |
| 724BC | band - metal band |
| 724BC-BK4S | clasp - clasp |
| 722BC-BK4G | clasp - clasp |
| 718BC-BK4G | clasp - clasp |
| 0351930 | others - winding stem |
| 82725880 | others - case ring |
| T060AS | others - push pin |
| Y5200 | others - machine code |
| Y52001002S | others - case |
| Y5200228XB14 | others - dial |
| Y5200228XG14 | others - dial |
| Y5200228XS14 | others - dial |
| 04V10NAM | others - minute hand |
| 04V10NAH | others - hour hand |