The Seiko 4N20-5550 is a watch model based on the 4N20 movement.
Parts List
| BA2A79JN02 | crystal - crystal |
| 30M57NA1 | crown - crown |
| 30M81NS5 | crown - crown |
| 0F150BA1S | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| E092AZ | band - band |
| E092BZ | band - band |
| 2CG052L0BDG | others - minute hand |
| 0351155 | others - winding stem |
| 81190055 | others - bracelet fixing pipe |
| 81607539 | others - bracelet fixing pin |
| 4N20555075A | others - case |
| 82837150 | others - case ring |
| 4N2055507EA | others - case |
| 4N201890XA15 | others - dial |
| 4N201890XA25 | others - dial |
| 4N2061 | others - machine code |
| 1CG037L0BDG | others - hour hand |