The Seiko 4N21-0670 is a watch model based on the 4N21 movement.
Parts List
| 190WC9SN01 | crystal |
| 6K30A1SNG0 | crown |
| 0F170BAA1 | case back gasket |
| AC004BAA1 | case back gasket - crown and stem gasket |
| DK51E | band - band |
| 3BA075F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| 4N211320XS19 | others - dial |
| 4N2164 | others - machine code |
| 4N21067075 | others - case |
| 4N210670 | others - case back |
| 1BA050A1BAA | others - hour hand |
| 82832995 | others - case ring |
| 0351155 | others - winding stem |
| 2BA075A1BAA | others - minute hand |