The Seiko 7820-5020 is a watch model based on the 7820 movement.
Parts List
| SA1N44GN00 | crystal |
| 35R08NA1 | crown |
| 35R08NS1 | crown - crown |
| 35R30NS1 | crown |
| 35R30NA1 | crown |
| 0H2930B09 | case back gasket |
| CK801 | band - leather band |
| CK892 | band - leather band |
| 12C02CGH | hand - hour hand |
| 12C02CGM | hand - minute hand |
| 12C02CSH | hand - hour hand |
| 12C02CSM | hand - minute hand |
| 7820502011 | others - case |
| 7820502025 | others - case |
| 7820502032U8 | others - dial |
| 782050208CB7 | others - dial |
| 7820503031B9 | others - dial |
| 83107230 | others - case ring |
| A200CS | others - push pin |
| 0354780 | others - setting/winding stem |
| 0884696 | others - holding ring for dial |