The Seiko 1221-5730 is a watch model based on the 1221 movement.
Parts List
| ES9W91SV01 | crystal - crystal (sapphire) |
| 30M19N05 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F145BAA1 | case back gasket |
| DB10A | band - metal band |
| 07S51JGH | hand - hour hand |
| 07S51JGM | hand - minute hand |
| 122110 | others - machine code |
| 12211030XS14 | others - dial |
| 1221573050A | others - case |
| 82721570 | others - case ring |
| 0351117 | others - winding stem |
| 07SS09VG | others - second hand |
Caliber 1221
