The Seiko 1E20-0440 is a watch model based on the 1E20 movement.
Parts List
| 110N02JN01 | crystal |
| 110N02JN | crystal |
| 30M98NA1 | crown |
| 0H1100N01 | case back gasket |
| 0H1100N0 | case back gasket |
| DZ0041B0 | case back gasket |
| Q5020G-LKG | band - link |
| Q5020C | band - metal band |
| Q5020C-LKG | band - link |
| Q5020G | band - metal band |
| Q5020G-BK4G | clasp - clasp |
| Q5020C-BK4G | clasp - clasp |
| 04V18DGH | others - hour hand |
| 04V18DGM | others - minute hand |
| 0351931 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82723580 | others - case ring |
| 1E200440 | others - case back |
| 1E20044025 | others - case |
| 1E2004402N | others - case |
| 1E201570XG14 | others - dial |
| 1E201570XG24 | others - dial |
| 1E208 | others - machine code |
| Q5020C-EPG | others - endpiece |
| Q5020G-EPG | others - endpiece |
| DZ0041B01 | others - crown and stem gasket |
| 2CE040LMBDG | others - minute hand |
| 1CE027LMBDG | others - hour hand |
Caliber 1E20
