The Seiko 8523-5020 is a watch model based on the 8523 movement.
Parts List
| ES3W55LM10 | crystal |
| ES3W55LM40 | crystal |
| 40MH1NS1 | crown - crown |
| 40MH1NN1 | crown - crown |
| 0G165BAA1 | case back gasket |
| EB0055B01 | others - crown and stem gasket |
Caliber 8523
Seiko 8523-5020 Watch Guide