The Seiko 1E20-0400 is a watch model based on the 1E20 movement.
Parts List
| 120N10JU01 | crystal - crystal |
| 32M08NA1 | crown |
| 0H1200N01 | case back gasket |
| Z5205H | band - band |
| Z5205C | band - band |
| Z5205C-LKG | band - link |
| Z5205H-LKG | band - link |
| Z5205H-PB1 | clasp - parts for buckle/clasp |
| Z5205C-PB1 | clasp - parts for buckle/clasp |
| Z5205H-BK4G | clasp - clasp |
| Z5205C-BK4S | clasp - clasp |
| 04V46CAH | others - hour hand |
| 04V46CAM | others - minute hand |
| 04V46DGH | others - hour hand |
| 04V46DGM | others - minute hand |
| 0351931 | others - winding stem |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 1E2004001Y | others - case |
| 82732560 | others - case ring |
| 1E200400 | others - case back |
| 1E200400HE | others - case |
| 1E201260X994 | others - dial |
| 1E201260XB14 | others - dial |
| 1E208 | others - machine code |
| 0354930 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
