The Seiko 4N21-1120 is a watch model based on the 4N21 movement.
Parts List
| 210A11SN02 | crystal - crystal |
| 30E31NA7 | crown - crown |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 0F190BAA3 | case back gasket - case back gasket |
| DAM6BW | band - band |
| DAQ3BW | band - band |
| 3BA090F1BNG | others - second hand |
| 2BB085A1BAF | others - minute hand |
| 1BA055A1BAA | others - hour hand |
| 2BA085A1BAA | others - minute hand |
| 1BB060A1BAF | others - hour hand |
| 82841590 | others - case ring |
| 0351156 | others - winding stem |
| 4N211120 | others - case back |
| 4N212630XG14 | others - dial |
| 4N212860XG14 | others - dial |
| 4N2165 | others - machine code |
| A130BS | others - push pin |
| 4N21112075A | others - case |
| 4N21112075B | others - case |