The Seiko 1E20-3C70 is a watch model based on the 1E20 movement.
Parts List
| SA1A62JR02 | crystal - crystal |
| 25M28NA1 | crown |
| 25M28NS1 | crown |
| 0F120NA1S | case back gasket |
| W190AZ | band - band |
| W189BZ | band - band |
| 04V42NAH | others - hour hand |
| 04V42NAM | others - minute hand |
| 04V42NSH | others - hour hand |
| 04V42NSM | others - minute hand |
| 82722120 | others - case ring |
| 0351931 | others - winding stem |
| 1E205C80XS19 | others - dial |
| 1E205C80XS29 | others - dial |
| 1E207 | others - machine code |
| 81880781 | others - case bow |
| 81880782 | others - case bow |
| 1E203C707E | others - case |
| 1E203C70 | others - case back |
| 1E203C707V | others - case |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
