The Seiko 8420-5440 is a watch model based on the 8420 movement.
Parts List
| ES4N82SN00 | crystal - crystal |
| 25M02NA4 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0G1900N01 | case back gasket - case back gasket |
| ES482SN00 | case back gasket |
| PK39A | band - band |
| 07R01DGH | others - hour hand |
| 07R01DGM | others - minute hand |
| A120BS | others - push pin (for lb) |
| 84205510XG14 | others - dial |
| 82702400 | others - case ring |
| 842054404L | others - case |
| 0354815 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 8420
