The Seiko 1221-5640 is a watch model based on the 1221 movement.
Parts List
| 30NB7NP5 | crown |
| 0F200BAA3 | case back gasket - case back gasket |
| AB19A | band - metal band |
| 08S51DGH | hand - hour hand |
| 08S51DGM | hand - minute hand |
| 08SS13VG | hand - second hand |
| 12210910XG14 | others - dial |
| 122110 | others - machine code |
| 1221564000A | others - case |
| 0351117 | others - winding stem |
Caliber 1221
