The Seiko 1E20-3180 is a watch model based on the 1E20 movement.
Parts List
| ES4A87JN02 | crystal - crystal |
| 6M30A5NNG1 | crown - crown |
| 6M30A5SNW0 | crown - crown |
| 0F110BA1S | case back gasket - case back gasket |
| D140BB | band - band |
| 81741370 | band - other |
| 81741371 | band - other |
| 81741372 | band - other |
| 81741373 | band - other |
| D137AB | band - band |
| D138AB | band - band |
| D139BB | band - band |
| 1CA022A1BNG | others - hour hand |
| 1CA022A1BNS | others - hour hand |
| 1E2031807EB | others - case |
| 1E205390XS14 | others - dial |
| 1E205390XS23 | others - dial |
| 1E205400XS13 | others - dial |
| 1E205400XS24 | others - dial |
| 1E207 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 0351931 | others - winding stem |
| 81190055 | others - bracelet fixing pipe |
| 81607519 | others - bracelet fixing pin |
| 1E20318075A | others - case |
| 82838590 | others - case ring |
| 1E203180 | others - case back |
| 1E20318075B | others - case |
| 1E2031807EA | others - case |
Caliber 1E20
