The Seiko 4N21-5260 is a watch model based on the 4N21 movement.
Parts List
| BA2A15JN02 | crystal - crystal |
| BA2A15SN02 | crystal - crystal |
| 40M0CNS1 | crown - crown |
| 0F180BA1S | case back gasket - case back gasket |
| D0L7AZ | band - band |
| D0L7CZ | band - band |
| D0L7GZ | band - band |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 2BG055LABDS | others - minute hand |
| 2BG055LABDG | others - minute hand |
| 1BG032L0BDS | others - hour hand |
| A120BS | others - push pin (for lb) |
| 4N212020XL14 | others - dial |
| 4N212020XS13 | others - dial |
| 4N212020XS24 | others - dial |
| 4N2164 | others - machine code |
| 4N2152607EA | others - case |
| 82873670 | others - case ring |
| 4N215260 | others - case back |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 4N2152607EB | others - case |
| 4N2152607NA | others - case |
| 1BG032L0BDG | others - hour hand |