The Seiko 4N01-5021 is a watch model based on the 4N01 movement.
Parts List
| SA0A27JN02 | crystal |
| SA0A27JN | crystal |
| 32M61NS1 | crown |
| 32M61NN1 | crown |
| 0H1400B01 | case back gasket - case back gasket |
| 0H1400B0 | case back gasket |
| B56267 | band - band |
| B56266 | band - band |
| B56267-BK3G | clasp - buckle |
| 1BA030A1BNS | others - hour hand |
| 1BA030A1BNG | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 2BA047A1BNS | others - minute hand |
| 2BA047A1BNG | others - minute hand |
| 82840275 | others - case ring |
| 4N010341XG14 | others - dial |
| 4N010341XS13 | others - dial |
| 4N0161 | others - machine code |
| T070AS | others - push pin |
| 4N01502125 | others - case |
| 4N015021 | others - case back |
| 0351155 | others - winding stem |
| 4N0150212E | others - case |
| DZ0040B01 | others - crown and stem gasket |