The Seiko 4N21-5080 is a watch model based on the 4N21 movement.
Parts List
| ES0A09SN01 | crystal |
| 30M57NA1 | crown - crown |
| 0H1700B01 | case back gasket - bezel gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| 0F170BAA3 | case back gasket - case back gasket |
| ZB25A | band - metal band |
| ZB26A | band - metal band |
| 1BH040A1BAA | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 0351155 | others - winding stem |
| 81180249 | others - bracelet fixing pipe |
| 81611339 | others - bracelet fixing pin |
| 4N210350XS14 | others - dial |
| 4N215080 | others - case back |
| 4N2150807L | others - case |
| 4N2150807X | others - case |
| 4N2164 | others - machine code |
| 82350451 | others - bezel |
| 82350455 | others - bezel |
| 82842710 | others - case ring |
| 05T27AGM | others - minute hand |
| 07SC04NG | others - second hand |
| 2BH057A1BAA | others - minute hand |