The Seiko 7820-5400 is a watch model based on the 7820 movement.
Parts List
| SA2N32GN00 | crystal |
| 35R08NA1 | crown |
| 35R08NS1 | crown - crown |
| 35R30NS1 | crown |
| 35R30NA1 | crown |
| 0A2930N01 | case back gasket - case back gasket |
| AV332 | band - band |
| AV341 | band - leather band |
| YK642 | band - leather band |
| YK651 | band - leather band |
| YK652 | band - leather band |
| 11C16DGH | hand - hour hand |
| 11C16DGM | hand - minute hand |
| 11C16DSH | hand - hour hand |
| 11C16DSM | hand - minute hand |
| 11C17DBH | hand - hour hand |
| 11C17DBM | hand - minute hand |
| 7820540011 | others - case |
| 7820540025 | others - case |
| 782055503187 | others - dial |
| 7820555034G4 | others - dial |
| 7820566031N3 | others - dial |
| 7820566032X4 | others - dial |
| 7820568001G9 | others - dial |
| 83107230 | others - case ring |
| A180CS | others - push pin |
| 0354780 | others - setting/winding stem |
| 0884710 | others - holding ring for dial |
| 09C48NBH | others - hour hand |
| 09C48NBM | others - minute hand |