The Seiko 1E20-5870 is a watch model based on the 1E20 movement.
Parts List
| K03N14JN | crystal |
| K03N14JN01 | crystal - crystal (inorganic) |
| 30M98NA1 | crown |
| 0H1100N0 | case back gasket |
| 0H1100N01 | case back gasket |
| DZ0041B0 | case back gasket |
| B5418C | band - metal band |
| B5418G | band - metal band |
| B5419G | band - metal band |
| B5419G-BK3G | clasp - clasp |
| B5418G-BK3G | clasp - clasp |
| B5418C-BK3G | clasp - clasp |
| 0351931 | others - winding stem |
| 04V10DGM | others - minute hand |
| 1E201500X994 | others - dial |
| 1E201500XG14 | others - dial |
| 1E201510XG14 | others - dial |
| 1E205870 | others - case back |
| 1E20587025 | others - case |
| 1E2058702N | others - case |
| 1E208 | others - machine code |
| 82804600 | others - case ring |
| T070AS | others - push pin |
| 04V10NGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
