The Seiko 4N21-5200 is a watch model based on the 4N21 movement.
Parts List
| K00W71SN02 | crystal - crystal |
| 6K30A1SNG0 | crown |
| 0F165BAA1 | case back gasket |
| AC004BAA1 | case back gasket - crown and stem gasket |
| KK32A | band - band |
| DAS3BW | band - band |
| 3BA075F1BNG | others - second hand |
| 1BC045A1BAA | others - hour hand |
| A100BS | others - push pin (for mb) |
| 4N211240XG14 | others - dial |
| 4N211820XS19 | others - dial |
| 4N2164 | others - machine code |
| 4N21520075A | others - case |
| 82833215 | others - case ring |
| 4N215200 | others - case back |
| 0351155 | others - winding stem |
| 1BA047A1BNG | others - hour hand |
| 2BA070A1BNG | others - minute hand |