The Seiko 4N21-0500 is a watch model based on the 4N21 movement.
Parts List
| 140A09SN02 | crystal - crystal |
| 6M30B5SNW0 | crown - crown |
| 6M30B5NNG1 | crown - crown |
| 0F140BAA3 | case back gasket - case back gasket |
| HK11D | band - band |
| HK03D | band - leather band |
| HK64C | band - leather band |
| 2BF060LABDG | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 06T23DHH | others - hour hand |
| 06T23DHM | others - minute hand |
| 82833415 | others - case ring |
| DZ0040B01 | others - crown and stem gasket |
| 4N21050075 | others - case |
| 4N210500 | others - case back |
| 4N2105007H | others - case |
| 4N210940XS14 | others - dial |
| 4N210940XS24 | others - dial |
| 4N211190XG14 | others - dial |
| 4N2164 | others - machine code |
| A110AS | others - push pin |
| 0351155 | others - winding stem |