The Seiko 4N20-5510 is a watch model based on the 4N20 movement.
Parts List
| ES3A01J20A | crystal - crystal |
| 6M30B5NNG1 | crown - crown |
| 6M30B5NNG2 | crown - crown |
| 0H1500B01 | case back gasket - case back gasket |
| D0K4AZ | band - band |
| D0K4FZ | band - band |
| 4N20551025A | others - case |
| 82862530 | others - case ring |
| 4N205510 | others - case back |
| 4N20551029A | others - case |
| 4N201840XL14 | others - dial |
| 4N201840XS14 | others - dial |
| 4N2061 | others - machine code |
| T060BG | others - push pin |
| T060BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 2CE047L0BDG | others - minute hand |
| 1CE030L2BDG | others - hour hand |