The Seiko 7321-5550 is a watch model based on the 7321 movement.
Parts List
| SA7W40GN00 | crystal - crystal |
| 30M58NA1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86572520 | crystal gasket - plastic gasket for crystal |
| DK47B | band - band |
| 06T34N1H | others - hour hand |
| 06T42NBM | others - minute hand |
| 07SC02NG | others - second hand |
| 0354735 | others - winding stem |
| 7321555075 | others - case |
| 82730980 | others - case ring |
| 73210991XS19 | others - dial |
| 73219 | others - machine code |
| A110AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |