The Seiko 1E20-5900 is a watch model based on the 1E20 movement.
Parts List
| RE5N20GN | crystal |
| RE5N20GN00 | crystal - crystal |
| 30M98NA1 | crown |
| 0H1400N01 | case back gasket - case back gasket |
| 0H1400N0 | case back gasket |
| DZ0041B0 | case back gasket |
| ZDA01G | band - leather band |
| ZDJ01G | band - leather band |
| ZDJ02G | band - leather band |
| 03V22DBM | hand - minute hand |
| 03V22NBH | hand - hour hand |
| 1E201550XG14 | others - dial |
| 1E201560X994 | others - dial |
| 1E201960XS19 | others - dial |
| 1E205900 | others - case back |
| 1E20590025 | others - case |
| 1E208 | others - machine code |
| T080AS | others - push pin |
| 0351931 | others - winding stem |
| 03V08DGH | others - hour hand |
| 82723120 | others - case ring |
| 03V08DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
