The Seiko 1221-5900 is a watch model based on the 1221 movement.
Parts List
| K00W57SN01 | crystal - crystal (sapphire) |
| 25M43DA4 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| MK62C | band - leather band |
| 07S213GH | hand - hour hand |
| 07S213GM | hand - minute hand |
| 122110 | others - machine code |
| 12211320XS14 | others - dial |
| 12215900 | others - case back |
| 122159007NA | others - case |
| 0351117 | others - winding stem |
| 82813750 | others - case ring |
| A100AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 07SS09VG | others - second hand |
Caliber 1221
