The Seiko 7321-5399 is a watch model based on the 7321 movement.
Parts List
| SABN22GN | crystal |
| SABN22GN00 | crystal - crystal (inorganic) |
| 35N20NS1 | crown |
| 35N20NA1 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0H1500N01 | case back gasket - case back gasket |
| 4GF6ZY | band - leather band |
| 07SC02NG | others - second hand |
| 05T02NGH | others - hour hand |
| 05T10NGM | others - minute hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 0354736 | others - winding stem |
| 73210780XB14 | others - dial |
| 7321539925 | others - case |
| 73219 | others - machine code |
| 82723740 | others - case ring |