The Seiko 4N21-0340 is a watch model based on the 4N21 movement.
Parts List
| 160A02SN02 | crystal - crystal (sapphire) |
| 6M30A3NNG1 | crown - crown |
| 0F140BAA3 | case back gasket - case back gasket |
| ZA35A | band - band |
| MK65F | band - band |
| MK26F | band - leather band |
| 1BA045A1BNG | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 1BF045L0BDG | others - hour hand |
| 2BF065L0BDG | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 4N210730XG19 | others - dial |
| 4N211080XS19 | others - dial |
| 4N2164 | others - machine code |
| 82840910 | others - case ring |
| 4N210340SA | others - case |
| 82361575 | others - bezel |
| 4N210340 | others - case back |
| 0351155 | others - winding stem |
| T070AS | others - push pin |
| 2BA067A1BNG | others - minute hand |