The Seiko 1221-5410 is a watch model based on the 1221 movement.
Parts List
| ESPN07SN00 | crystal - crystal (sapphire) |
| 27N01DH5 | crown - crown |
| 0H1500B01 | case back gasket - case back gasket |
| 06S01DGH | others - hour hand |
| 06S01DGM | others - minute hand |
| 12210610XG14 | others - dial |
| 122110 | others - machine code |
| 1221541025A | others - case |
| 82706770 | others - case ring |
| DZ0040B01 | others - crown and stem gasket |
| 0351117 | others - winding stem |
| 06SS05VG | others - second hand |
Caliber 1221
