The Seiko 1221-5840 is a watch model based on the 1221 movement.
Parts List
| REDN33SV01 | crystal - crystal (sapphire) |
| 27M03DA5 | crown - crown |
| 0F180NA11 | case back gasket - case back gasket |
| 86204515 | band - other |
| DK66B | band - leather band |
| 05SS053G | hand - second hand |
| 06S01DGH | others - hour hand |
| 06S01DGM | others - minute hand |
| A130AS | others - push pin (for lb) |
| 122110 | others - machine code |
| 12211150XB14 | others - dial |
| 12215840GWA | others - case |
| 82731230 | others - case ring |
| 0351117 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1221
