The Seiko 1221-5530 is a watch model based on the 1221 movement.
Parts List
| ESRN55JN00 | crystal - crystal (inorganic) |
| 30N63NS1 | crown |
| 30N63NA1 | crown - crown |
| 0H1600B01 | case back gasket - case back gasket |
| 0H1650B01 | case back gasket - case back gasket |
| HS12A | band - metal band |
| HS13A | band - metal band |
| 3BA075F1BNG | others - second hand |
| 1AA040A1BNG | others - hour hand |
| 2AA060A1BNG | others - minute hand |
| 06P05NGH | others - hour hand |
| 06P05NGM | others - minute hand |
| 12210770XG14 | others - dial |
| 12210770XS14 | others - dial |
| 122110 | others - machine code |
| 1221553025 | others - case |
| 122155302N | others - case |
| 82710670 | others - case ring |
| B090AS | others - push pin |
| 06SC11NG | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351117 | others - winding stem |
Caliber 1221
