The Seiko 1221-5770 is a watch model based on the 1221 movement.
Parts List
| RECN73SV01 | crystal - crystal (sapphire) |
| 30NE1DA5 | crown - crown |
| 0F180NA11 | case back gasket - case back gasket |
| ZK44A | band - leather band |
| 06S03DHH | hand - hour hand |
| 06S03DHM | hand - minute hand |
| 06SS01VG | hand - second hand |
| 122110 | others - machine code |
| 12211080XG14 | others - dial |
| 1221577025A | others - case |
| 82723050 | others - case ring |
| 84307195 | others - dial ring |
| A140AS | others - push pin |
| 0351117 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1221
