The Seiko 4N21-0270 is a watch model based on the 4N21 movement.
Parts List
| 190WC9SN01 | crystal |
| 6M30A3NNG1 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| HA23A | band - band |
| 3BA125F1BNG | others - second hand |
| 1BA055A1BNG | others - hour hand |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 82833515 | others - case ring |
| 4N2102707H | others - case |
| 4N210270 | others - case back |
| 4N210660XS14 | others - dial |
| 4N210670XS14 | others - dial |
| 4N2164 | others - machine code |
| B080BS | others - push pin |
| 2BA080A1BNG | others - minute hand |
| 08T79DGH | others - hour hand |
| 08T79DGM | others - minute hand |