The Seiko 4N21-5270 is a watch model based on the 4N21 movement.
Parts List
| SA2A15SN02 | crystal - crystal |
| 6M35A2SNWC | crown - crown |
| 6M35A2SNGB | crown - crown |
| 0F160BA1S | case back gasket - case back gasket |
| DB89BB | band - band |
| DB90AB | band - band |
| 1BH045A1BNB | others - hour hand |
| 2BH065A1BNB | others - minute hand |
| 3BA075F1BAB | others - second hand |
| A100BS | others - push pin (for mb) |
| 4N212040XA19 | others - dial |
| 4N212050XA19 | others - dial |
| 4N21527076A | others - case |
| 4N2164 | others - machine code |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 82873830 | others - case ring |
| 4N215270 | others - case back |
| 4N2152707EA | others - case |