The Seiko 4N20-5440 is a watch model based on the 4N20 movement.
Parts List
| ES3A19J20B | crystal - crystal |
| 6M30C3NNG1 | crown - crown |
| 0H1600B01 | case back gasket - case back gasket |
| D0E3BB | band - band |
| D0E3CB | band - band |
| 1CC030A1BNG | others - hour hand |
| 2CC045A1BNG | others - minute hand |
| DA007BA11 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 81610279 | others - bracelet fixing pin |
| 82863710 | others - case ring |
| 4N20544025A | others - case |
| 4N205440 | others - case back |
| 4N2054402HA | others - case |
| 4N201730XG14 | others - dial |
| 4N201730XS14 | others - dial |
| 4N2061 | others - machine code |