The Seiko 2E20-7639 is a watch model based on the 2E20 movement.
Parts List
| RE5A91J20A | crystal - crystal |
| 6M30B5SNG0 | crown - crown |
| 0F140BA1S | case back gasket - case back gasket |
| 48W4WZ-LK4 | band - link |
| 48W4WZ | band - band |
| 48W4WZ-BKN | clasp - buckle |
| 1DE022LABDG | others - hour hand |
| 2DE035LBBDG | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351207 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82873710 | others - case ring |
| 2E207639HEA | others - case |
| 2E207639 | others - case back |
| 2E203451XN14 | others - dial |
Caliber 2E20
