The Seiko 7820-5040 is a watch model based on the 7820 movement.
Parts List
| RE1N06GN00 | crystal |
| 35R30NA1 | crown |
| 35R08NS1 | crown - crown |
| 35R30NS1 | crown |
| 0H3130B09 | case back gasket |
| 09C69CSH | hand - hour hand |
| 09C69CSM | hand - minute hand |
| 10C20CKH | hand - hour hand |
| 10C20CKM | hand - minute hand |
| 7820504011 | others - case |
| 782050508CB7 | others - dial |
| 78205060804L | others - dial |
| 83107230 | others - case ring |
| 0354780 | others - setting/winding stem |
| 0884691 | others - holding ring for dial |