The Seiko 1221-5420 is a watch model based on the 1221 movement.
Parts List
| ESSN01JN00 | crystal - crystal (inorganic) |
| 30N63NA1 | crown - crown |
| 0H1900B01 | case back gasket - case back gasket |
| KK07A | band - leather band |
| 1AA055A3BNG | others - hour hand |
| 3BA125F1BNG | others - second hand |
| 08P13DGH | others - hour hand |
| 08P13DGM | others - minute hand |
| 0351117 | others - winding stem |
| 12210630XG14 | others - dial |
| 122110 | others - machine code |
| 1221542025 | others - case |
| 82711410 | others - case ring |
| A120AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 08SC29NG | others - second hand |
| 2AA080A3BNG | others - minute hand |
Caliber 1221
