The Seiko W520-4A00 is a watch model based on the W520 movement.
Parts List
| 0G320BA12 | case back gasket - case back gasket |
| FF64JB | band - band |
| FF65JB | band - band |
| FF66JB | band - band |
| FF67JB | band - band |
| W5204A0003E | others - case |
| W5204A0004E | others - case |
| T180CS | others - push pin |
| W5204A0001E | others - case |
| W5204A0002E | others - case |