The Seiko 4N20-1020 is a watch model based on the 4N20 movement.
Parts List
| 170A02JN02 | crystal - crystal |
| 6M30A3NNG1 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| D079BQ | band - metal band |
| 2CA067A1BNG | others - minute hand |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81606459 | others - bracelet fixing pin |
| 82841030 | others - case ring |
| 4N201020 | others - case back |
| 4N20102075A | others - case |
| 4N201650XG14 | others - dial |
| 4N2061 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 1CA045A1BNG | others - hour hand |