The Seiko 1E20-5540 is a watch model based on the 1E20 movement.
Parts List
| RE9N36JM01 | crystal - crystal (inorganic) |
| 30M68NA1 | crown - crown |
| 0H1200N01 | case back gasket |
| B5315D-LKG | band - link |
| B5315D | band - metal band |
| B5315D-BK4G | clasp - buckle |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 82722120 | others - case ring |
| 1E200890XB14 | others - dial |
| 1E2055401B | others - case |
| 1E208 | others - machine code |
| 04V10DGM | others - minute hand |
| 03V06NGH | others - hour hand |
| 0351931 | others - winding stem |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
