The Seiko 4N21-5190 is a watch model based on the 4N21 movement.
Parts List
| SA1A01SN02 | crystal - crystal |
| 6K30A1SNG0 | crown |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 0F180BAA3 | case back gasket |
| DAP3BW | band - band |
| DAP3BW-BJ00 | clasp - buckle |
| 3BA075F1BAB | others - second hand |
| 06T03DHH | others - hour hand |
| 06T03DHM | others - minute hand |
| 1BH040A1BNB | others - hour hand |
| 2BH060A1BNB | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 1BA040A1BAA | others - hour hand |
| 2BA060A1BAA | others - minute hand |
| 0351155 | others - winding stem |
| 1BA040A1BNG | others - hour hand |
| 82842630 | others - case ring |
| 4N21519075 | others - case |
| 4N215190 | others - case back |
| 4N21519075A | others - case |
| 4N21519075B | others - case |
| 4N21519075C | others - case |
| 4N211230XB14 | others - dial |
| 4N211230XG14 | others - dial |
| 4N211230XS14 | others - dial |
| 4N212400XS19 | others - dial |
| 4N212560XS14 | others - dial |
| 4N212850XS19 | others - dial |
| 4N2164 | others - machine code |
| 4N2165 | others - machine code |
| A130BS | others - push pin |
| 2BA060A1BNG | others - minute hand |