The Seiko 1E20-5779 is a watch model based on the 1E20 movement.
Parts List
| ESGN12JM | crystal |
| ESGN12JM01 | crystal - crystal (inorganic) |
| 30M68NA1 | crown - crown |
| 0H1300N01 | case back gasket |
| 0H1300N0 | case back gasket |
| DZ0041B0 | case back gasket |
| B5365C | band - metal band |
| B5365G | band - metal band |
| B5365C-BK3G | clasp - clasp |
| B5365G-BK3G | clasp - clasp |
| 03V10DGH | others - hour hand |
| 03V10DGM | others - minute hand |
| 0351931 | others - winding stem |
| 1E201370XB14 | others - dial |
| 1E201370XG14 | others - dial |
| 1E205779 | others - case back |
| 1E20577925 | others - case |
| 1E205779EA | others - case |
| 1E208 | others - machine code |
| 82801280 | others - case ring |
| B5365G-EP2 | others - endpiece |
| B5365C-EP2 | others - endpiece |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
