The Seiko 4N21-0810 is a watch model based on the 4N21 movement.
Parts List
| 210A02SN02 | crystal - crystal (sapphire) |
| 6K30A1SNG0 | crown |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 0F190BAA3 | case back gasket - case back gasket |
| DAM6BW | band - band |
| 3BA090F1BNG | others - second hand |
| 1BB060A1BNG | others - hour hand |
| 2BB085A1BNG | others - minute hand |
| 82841590 | others - case ring |
| 0351156 | others - winding stem |
| 4N21081075A | others - case |
| 4N210810 | others - case back |
| 4N21081075B | others - case |
| 4N21081075C | others - case |
| 4N211570XS14 | others - dial |
| 4N212610XG14 | others - dial |
| 4N2164 | others - machine code |
| A130BS | others - push pin |