The Seiko 1E20-3C40 is a watch model based on the 1E20 movement.
Parts List
| K01A10JR02 | crystal - crystal |
| 6M35B6SNG1 | crown - crown |
| 6M35B6SNW1 | crown - crown |
| 0E130NA1S | case back gasket |
| 0E130BA1S | case back gasket - case back gasket |
| 44Z7AQ | band - band |
| 44Z7KQ | band - band |
| 44Z7JQ | band - band |
| 44Z7AQ-LK3 | band - link |
| 44Z7JQ-LK3 | band - link |
| 44Z7KQ-LK3 | band - link |
| 44Z7KQ-BKI | clasp - buckle |
| 44Z7KQ-PB2 | clasp - parts for buckle |
| 44Z7JQ-BKI | clasp - buckle |
| 44Z7JQ-PB2 | clasp - parts for buckle |
| 44Z7AQ-BKI | clasp - buckle |
| 44Z7AQ-PB2 | clasp - parts for buckle |
| 03V12DSM | others - minute hand |
| 03V12DSH | others - hour hand |
| 03V12DGH | others - hour hand |
| 03V12DGM | others - minute hand |
| 0351931 | others - winding stem |
| 1E203C4029Z | others - case |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82837720 | others - case ring |
| 1E203C4025Z | others - case |
| 1E203C40 | others - case back |
| 1E205C30XG23 | others - dial |
| 1E205C38XG14 | others - dial |
| 1E205C38XG23 | others - dial |
| 1E205C40XS29 | others - dial |
| 1E205C48XG19 | others - dial |
| 1E205C48XS29 | others - dial |
| 1E207 | others - machine code |
| 44Z7AQ-EP1 | others - endpiece |
| 1E203C4029 | others - case |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1E20
