The Seiko 4N20-0450 is a watch model based on the 4N20 movement.
Parts List
| 180A02JN02 | crystal - crystal |
| 6M45A1NNG0 | crown - crown |
| 6M45A1NNW0 | crown - crown |
| 0H1900B01 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| MN04A | band - band |
| MN03A | band - band |
| 08Y25AGH | others - hour hand |
| 07Y75CGM | others - minute hand |
| 0351157 | others - winding stem |
| 81181859 | others - bracelet fixing pipe |
| 4N20045026 | others - case |
| 82850590 | others - case ring |
| 4N200450 | others - case back |
| 4N20045029A | others - case |
| 4N200740XS19 | others - dial |
| 4N201920XS19 | others - dial |
| 4N2061 | others - machine code |
| 81332291 | others - spring |
| 81872573 | others - case bow |