The Seiko 8420-5400 is a watch model based on the 8420 movement.
Parts List
| SA5N94SN00 | crystal - crystal |
| 25M02NA4 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0G1900N01 | case back gasket - case back gasket |
| DK69A | band - band |
| 07R01DGH | others - hour hand |
| 07R01DGM | others - minute hand |
| 842054004F | others - case |
| 82702440 | others - case ring |
| 84205460XG14 | others - dial |
| A140BS | others - push pin |
| 0354815 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
