The Seiko 1E20-5109 is a watch model based on the 1E20 movement.
Parts List
| RE5N20GN | crystal |
| RE5N20GN00 | crystal - crystal |
| 30M68NA1 | crown - crown |
| 0H1400N01 | case back gasket - case back gasket |
| 0H1400N0 | case back gasket |
| DZ0041B0 | case back gasket |
| B5175G | band - band |
| B5174G | band - band |
| B5174G-BK3G | clasp - clasp |
| B5175G-BK3G | clasp - clasp |
| 03V10DGH | others - hour hand |
| 03V10DGM | others - minute hand |
| 04V18DGH | others - hour hand |
| 04V18DGM | others - minute hand |
| 0351931 | others - winding stem |
| 82723120 | others - case ring |
| 1E200210XG14 | others - dial |
| 1E200270XA15 | others - dial |
| 1E20510925 | others - case |
| 1E208 | others - machine code |
| B5175G-EP2 | others - endpiece |
| B5174G-EP2 | others - endpiece |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 2CE040LMBDG | others - minute hand |
| 1CE027LMBDG | others - hour hand |
Caliber 1E20
