The Seiko 1E20-6420 is a watch model based on the 1E20 movement.
Parts List
| ES0A34SN01 | crystal - crystal |
| 26M04EE3 | crown |
| 0E120NA1S | case back gasket |
| 0E120BA1S | case back gasket - case back gasket(lower) |
| XX000 | band - band |
| 04V50JGH | others - hour hand |
| 04V50JGM | others - minute hand |
| 81501645 | others - case back screw |
| 1E20642043 | others - case |
| 82834720 | others - case ring |
| 1E202410XG14 | others - dial |
| 1E208 | others - machine code |
| T090AS | others - push pin |
| 0351931 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
