The Seiko 7321-5640 is a watch model based on the 7321 movement.
Parts List
| SA8W02HM01 | crystal |
| SA8W02HM02 | crystal - crystal (inorganic) |
| SA8W02HM0S | crystal |
| 30M58NA1 | crown - crown |
| 30M58NS1 | crown |
| 0A1800N01 | case back gasket |
| 86573100 | crystal gasket - plastic gasket for crystal |
| G5044D | band - metal band |
| G5044D-BK5G | clasp - clasp |
| 07SC02NG | others - second hand |
| EZ0035B0A | others - crown and stem gasket |
| A110AS | others - push pin |
| 0354735 | others - winding stem |
| 82723460 | others - case ring |
| 73211110XN24 | others - dial |
| 73215640WE | others - case |
| 73219 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 2BE052L0BDG | others - minute hand |
| 05T16DGM | others - minute hand |
| 1BE032L0BDG | others - hour hand |
| 05T16DGH | others - hour hand |