The Seiko 1E20-5990 is a watch model based on the 1E20 movement.
Parts List
| BA3N20JN | crystal |
| BA3N20JN01 | crystal - crystal (inorganic) |
| 30M98NA1 | crown |
| 0H1300N01 | case back gasket |
| 0H1300N0 | case back gasket |
| DZ0041B0 | case back gasket |
| B5447C-LKG | band - link |
| B5447C | band - metal band |
| B5447C-BK4S | clasp - clasp |
| 0351931 | others - winding stem |
| 04V10DGM | others - minute hand |
| 1E201740X994 | others - dial |
| 1E205990 | others - case back |
| 1E2059902N | others - case |
| 1E208 | others - machine code |
| 82732380 | others - case ring |
| B090AS | others - push pin |
| 04V10NGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
