The Seiko 7321-5540 is a watch model based on the 7321 movement.
Parts List
| RE6N44GN00 | crystal - crystal |
| 30M54NS1 | crown - crown |
| 0H2300N01 | case back gasket |
| GA15B | band - band |
| 08T12NSH | others - hour hand |
| 08T38NSM | others - minute hand |
| 07SC02NS | others - second hand |
| 0354735 | others - winding stem |
| 7321554011 | others - case |
| 82731040 | others - case ring |
| 73210980XN19 | others - dial |
| 73219 | others - machine code |
| A150BS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |