The Seiko 4N20-5129 is a watch model based on the 4N20 movement.
Parts List
| ESFW07JN01 | crystal |
| ESFW07JN | crystal |
| 27M19NA1 | crown - crown |
| 0F130BAA3 | case back gasket - case back gasket |
| DZ0040B0 | case back gasket |
| G5154G | band |
| G5154G-LKG | band - link |
| G5154G-BK4G | clasp - clasp |
| 04Y17DGM | others - minute hand |
| 0351155 | others - winding stem |
| T070BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 4N200430XS14 | others - dial |
| 4N205129 | others - case back |
| 4N20512975 | others - case |
| 4N2061 | others - machine code |
| 82833135 | others - case ring |
| 04Y17NGH | others - hour hand |