The Seiko 1221-5590 is a watch model based on the 1221 movement.
Parts List
| RE9N27HN00 | crystal |
| 30N63NA1 | crown - crown |
| 0H1650B01 | case back gasket - case back gasket |
| DL52A | band - leather band |
| 1AA040A1BNG | others - hour hand |
| 2AA060A1BNG | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 06P05NGH | others - hour hand |
| 06P05NGM | others - minute hand |
| 12210840XG14 | others - dial |
| 12210840XN14 | others - dial |
| 122110 | others - machine code |
| 1221559025 | others - case |
| 122155902N | others - case |
| 82712550 | others - case ring |
| A150AS | others - push pin |
| 06SC11NG | others - second hand |
| 0351117 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1221
