The Seiko 4N21-1040 is a watch model based on the 4N21 movement.
Parts List
| 210A11JN02 | crystal - crystal |
| 6M30Z3NNGF | crown - crown |
| 0F190BAA3 | case back gasket - case back gasket |
| DAP3BW | band - band |
| DAP3BW-BJ00 | clasp - buckle |
| 3BA090F1BNG | others - second hand |
| 1BB060A1BNG | others - hour hand |
| 2BB085A1BNG | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 82841590 | others - case ring |
| 4N21104075A | others - case |
| 4N211040 | others - case back |
| 4N212280XS14 | others - dial |
| 4N2164 | others - machine code |
| A130BS | others - push pin |