The Seiko 1E20-5390 is a watch model based on the 1E20 movement.
Parts List
| RE7N36GM01 | crystal |
| 30M86NS1 | crown |
| 0H2100N01 | case back gasket - case back gasket |
| 0H1500N01 | case back gasket - case back gasket |
| HK59A | band - leather band |
| 07V44NLH | others - hour hand |
| 81180229 | others - bracelet fixing pipe |
| 81602889 | others - bracelet fixing pin |
| 1E200700XS19 | others - dial |
| 1E203 | others - machine code |
| 1E205390F0 | others - case |
| 81502449 | others - screw |
| 82311669 | others - bezel |
| 82731880 | others - case ring |
| 07V48NLM | others - minute hand |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
