The Seiko 1E20-5850 is a watch model based on the 1E20 movement.
Parts List
| SAFN08JN | crystal |
| SAFN08JN01 | crystal - crystal (inorganic) |
| 30M98NA1 | crown |
| 0H1300N01 | case back gasket |
| 0H1300N0 | case back gasket |
| DZ0041B0 | case back gasket |
| B5416G-LKG | band - link |
| B5416C | band - metal band |
| B5416C-LKG | band - link |
| B5416G | band - metal band |
| B5416G-BK4G | clasp - clasp |
| B5416C-BK4G | clasp - clasp |
| 04V10DGM | others - minute hand |
| 03V06NGH | others - hour hand |
| 0351931 | others - winding stem |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 1E201470X994 | others - dial |
| 1E201470XG14 | others - dial |
| 1E201470XG24 | others - dial |
| 1E205850 | others - case back |
| 1E20585025 | others - case |
| 1E2058502N | others - case |
| 1E208 | others - machine code |
| 82810040 | others - case ring |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
