The Seiko 1221-5240 is a watch model based on the 1221 movement.
Parts List
| ESLN75SN00 | crystal - crystal (sapphire) |
| 27N01NA5 | crown |
| 0H1750B01 | case back gasket |
| PK08B | band - leather band |
| 06SS01VG | hand - second hand |
| 07S05DGH | hand - hour hand |
| 07S05DGM | hand - minute hand |
| 12210400XG14 | others - dial |
| 122110 | others - machine code |
| 122152404LA | others - case |
| 82703970 | others - case ring |
| A120AS | others - push pin |
| 0351117 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1221
