The Seiko 4N21-006S is a watch model based on the 4N21 movement.
Parts List
| 190A02JN02 | crystal - crystal (inorganic) |
| 190N53JN00 | crystal - crystal |
| 6M30B5NNG1 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| HK58C | band - band |
| 3BA075F1BNG | others - second hand |
| 06T05AGM | others - minute hand |
| 1BA042A1BAA | others - hour hand |
| 2BA065A1BAA | others - minute hand |
| A120BS | others - push pin (for lb) |
| 4N210680XS15 | others - dial |
| 4N2164 | others - machine code |
| 4N21006S75 | others - case |
| 4N21006S | others - case back |
| 82833515 | others - case ring |
| 06SC11NG | others - second hand |
| DZ0040B01 | others - crown and stem gasket |