The Seiko 4N21-0160 is a watch model based on the 4N21 movement.
Parts List
| 180A02SN02 | crystal - crystal (sapphire) |
| 30M57NA1 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| DT30A | band - metal band |
| DT31A | band - metal band |
| 3BA125F1BNG | others - second hand |
| 2BH075A1BDG | others - minute hand |
| 07T17DGM | others - minute hand |
| 81181459 | others - bracelet fixing pipe |
| 81607199 | others - bracelet fixing pin |
| 82832995 | others - case ring |
| 4N210160 | others - case back |
| 4N21016075 | others - case |
| 4N2101607N | others - case |
| 4N210370XG14 | others - dial |
| 4N210370XS14 | others - dial |
| 4N2164 | others - machine code |
| 0351156 | others - winding stem |
| 1BH050A1BNG | others - hour hand |
| 08SC29NG | others - second hand |