The Seiko 1221-5810 is a watch model based on the 1221 movement.
Parts List
| RECN69SV02 | crystal - crystal (sapphire) |
| 30N63NA1 | crown - crown |
| 0F245NA11 | case back gasket - case back gasket |
| AA35B | band - metal band |
| 09S39JGH | hand - hour hand |
| 09S39JGM | hand - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81181919 | others - bracelet fixing pipe |
| 81607699 | others - bracelet fixing pin |
| 0351117 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 122110 | others - machine code |
| 12211040XB14 | others - dial |
| 122158100J | others - case |
| 82722930 | others - case ring |
| 07SS09VG | others - second hand |
| 09SS01VG | others - second hand |
Caliber 1221
