The Seiko 7820-5210 is a watch model based on the 7820 movement.
Parts List
| SA1N70GN00 | crystal |
| 35R06NS1 | crown - crown |
| 35R30NA1 | crown |
| 35R30NS1 | crown |
| 0H2930B09 | case back gasket |
| LK511 | band - leather band |
| 12C18DSH | hand - hour hand |
| 12C18DSM | hand - minute hand |
| 0354780 | others - setting/winding stem |
| 0884719 | others - holding ring for dial |
| 7820521011 | others - case |
| 782053108HB3 | others - dial |
| 83107230 | others - case ring |
| A180CS | others - push pin |