The Seiko 7820-7020 is a watch model based on the 7820 movement.
Parts List
| 280N02GN00 | crystal |
| 35R30NA1 | crown |
| 35R08NS1 | crown - crown |
| 35R30NS1 | crown |
| 0Z2695L01 | case back gasket |
| 0Z2696L01 | case back gasket |
| 0H2600N01 | case back gasket - case back gasket |
| LL03A | band - leather band |
| 12C44CSH | hand - hour hand |
| 12C44CSM | hand - minute hand |
| 7820702011 | others - case |
| 78207030XS17 | others - dial |
| 83119681 | others - case ring |
| A170CS | others - push pin |
| 0354780 | others - setting/winding stem |