The Seiko 8523-0020 is a watch model based on the 8523 movement.
Parts List
| 195W41LN00 | crystal |
| 40MG3NS1 | crown |
| 40MG3NA1 | crown |
| FH2030B01 | case back gasket - case back gasket |
| EB0055B01 | others - crown and stem gasket |
Caliber 8523
Seiko 8523-0020 Watch Guide