The Seiko 1221-5850 is a watch model based on the 1221 movement.
Parts List
| REDN31SV01 | crystal - crystal (sapphire) |
| 30M31DG5 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F210BAA5 | case back gasket - case back gasket |
| GK65A | band - leather band |
| 08S51DGH | hand - hour hand |
| 08S51DGM | hand - minute hand |
| 08SS13VG | hand - second hand |
| 122110 | others - machine code |
| 12211160XS14 | others - dial |
| 1221585000A | others - case |
| 82731190 | others - case ring |
| A180AS | others - push pin |
| 0351117 | others - winding stem |
Caliber 1221
