The Seiko 2320-5540 is a watch model based on the 2320 movement.
Parts List
| ES1N18GN00 | crystal |
| 30M06NA1 | crown - crown |
| 30M06NS1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1700N01 | case back gasket - case back gasket |
| 0A1700N0 | case back gasket |
| DI033 | band - band |
| DI034 | band - band |
| 05R14DGH | others - hour hand |
| 05R14DGM | others - minute hand |
| 05R14DSH | others - hour hand |
| 05R14DSM | others - minute hand |
| 232008608AQ3 | others - dial |
| 232008608GS4 | others - dial |
| 23201 | others - machine code |
| 2320554026 | others - case |
| 83119120 | others - case ring |
| 232055402E | others - case |
| 0354811 | others - winding stem |
Caliber 2320
