The Seiko 1221-5920 is a watch model based on the 1221 movement.
Parts List
| ET6N11SN01 | crystal - crystal (sapphire) |
| 27M19NA1 | crown - crown |
| 27M19NS1 | crown |
| 0G1600B01 | case back gasket - case back gasket |
| 0G1650B01 | case back gasket - case back gasket |
| 2BA055A1BNG | others - minute hand |
| 2BA055A1BNS | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 1BA037A1BNS | others - hour hand |
| 06SC15NG | others - second hand |
| 06SC15NS | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351117 | others - winding stem |
| 1BA037A1BNG | others - hour hand |
| 122110 | others - machine code |
| 12211440XG14 | others - dial |
| 12211440XS13 | others - dial |
| 1221592011 | others - case |
| 1221592025 | others - case |
| 82823650 | others - case ring |
| 05T11NGM | others - minute hand |
| 05T11NSM | others - minute hand |
| 05T05DGH | others - hour hand |
| 05T05NSH | others - hour hand |
Caliber 1221
