The Seiko 4N20-5420 is a watch model based on the 4N20 movement.
Parts List
| BA0A39JN02 | crystal - crystal |
| 40MY7NA1 | crown - crown |
| 0F170BAA3 | case back gasket - case back gasket |
| DAT1BW | band - band |
| DAT2BW | band - band |
| 1CH030A1BAA | others - hour hand |
| 2CH045A1BAA | others - minute hand |
| A110BS | others - push pin (for mb) |
| 4N201570XS19 | others - dial |
| 4N201570XS29 | others - dial |
| 4N2061 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 4N20542075A | others - case |
| 4N205420 | others - case back |
| 82851190 | others - case ring |