The Seiko 4N21-0150 is a watch model based on the 4N21 movement.
Parts List
| 160A02SN02 | crystal - crystal (sapphire) |
| 30M57NA1 | crown - crown |
| AC004BA11 | case back gasket - crown and stem gasket |
| 0F140BAA3 | case back gasket - case back gasket |
| TT45A | band - metal band |
| TT46A | band - metal band |
| 3BA075F1BNG | others - second hand |
| 1BC040A1BNG | others - hour hand |
| 2BC060A1BNG | others - minute hand |
| 0351155 | others - winding stem |
| 06SC11NG | others - second hand |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82833415 | others - case ring |
| 4N210150 | others - case back |
| 4N21015075 | others - case |
| 4N2101507N | others - case |
| 4N210340XG14 | others - dial |
| 4N210340XS14 | others - dial |
| 4N2164 | others - machine code |
| 06T19NGM | others - minute hand |