The Seiko 1221-5710 is a watch model based on the 1221 movement.
Parts List
| ESXN45JN01 | crystal - crystal (inorganic) |
| 30N99NS1 | crown |
| 30N99NA1 | crown - crown |
| 0F150NA11 | case back gasket - case back gasket |
| KZ07A | band - metal band |
| KZ08A | band - metal band |
| 06P47DSH | hand - hour hand |
| 06P47DSM | hand - minute hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 1AG040LABDG | others - hour hand |
| 2AG060LABDG | others - minute hand |
| 06P47DGM | others - minute hand |
| 06P47DGH | others - hour hand |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| DZ0040B01 | others - crown and stem gasket |
| 0351117 | others - winding stem |
| 06SC11NG | others - second hand |
| 122110 | others - machine code |
| 12211010XS14 | others - dial |
| 12211010XS23 | others - dial |
| 1221571025 | others - case |
| 122157102E | others - case |
| 82721990 | others - case ring |
| 06SC11NS | others - second hand |
Caliber 1221
