The Seiko 1E20-5420 is a watch model based on the 1E20 movement.
Parts List
| SACN48JM01 | crystal - crystal (inorganic) |
| 30M68NA1 | crown - crown |
| 0H1500N01 | case back gasket - case back gasket |
| B5288C | band - metal band |
| B5288G | band - metal band |
| B5288C-BK5S | clasp - buckle |
| B5288G-BK5G | clasp - buckle |
| 1E200750XG14 | others - dial |
| 1E200750XN14 | others - dial |
| 1E20542025 | others - case |
| 1E2054202N | others - case |
| 1E208 | others - machine code |
| 82732680 | others - case ring |
| B5288C-EP2 | others - endpiece |
| B5288G-EP2 | others - endpiece |
| 0351931 | others - winding stem |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 04V02DGM | others - minute hand |
| 1CE030L2BDG | others - hour hand |
| 04V02DGH | others - hour hand |
Caliber 1E20
