The Seiko 4N21-0072 is a watch model based on the 4N21 movement.
Parts List
| 190A02JN02 | crystal - crystal (inorganic) |
| 190N53JN00 | crystal - crystal |
| 30M57NA1 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| RS08A | band - band |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| 82833515 | others - case ring |
| 4N21007275 | others - case |
| 4N210072 | others - case back |
| 4N210110XG14 | others - dial |
| 4N211010XG14 | others - dial |
| 4N2164 | others - machine code |
| B090AS | others - push pin |
| 08T09NGH | others - hour hand |
| 08T09NGM | others - minute hand |
| 2BC080A1BNG | others - minute hand |
| 1BC055A1BNG | others - hour hand |