The Seiko 1221-5870 is a watch model based on the 1221 movement.
Parts List
| SAFN95SK01 | crystal - crystal (sapphire) |
| 25N09DE1 | crown |
| 0H2400B01 | case back gasket - case back gasket |
| 2K03A | band - leather band |
| 81833495 | band - other |
| 08T39VGH | hand - hour hand |
| 08T39VGM | hand - minute hand |
| A130AS | others - push pin (for lb) |
| 82810590 | others - case ring |
| A160BS | others - push pin |
| 122110 | others - machine code |
| 12211220XS14 | others - dial |
| 12215870GC | others - case |
| 08SC653G | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351117 | others - winding stem |
Caliber 1221
