The Seiko 2E20-5540 is a watch model based on the 2E20 movement.
Parts List
| SA4W57HN01 | crystal |
| SA4W57HN | crystal |
| 32M29NA1 | crown |
| 32M29NS1 | crown |
| 0F145BAA | case back gasket |
| 0F145BAA1 | case back gasket |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F145BAA7 | case back gasket |
| 86572995 | crystal gasket - plastic gasket for crystal |
| R5005G | band - metal band |
| R5005S | band - metal band |
| R5005S-BK3S | clasp - clasp |
| R5005G-BK3G | clasp - clasp |
| 1CG027LABDS | others - hour hand |
| 2EA040A3BDG | others - minute hand |
| 04V07DHM | others - minute hand |
| 1CA025A3BNG | others - hour hand |
| 04L05DSH | others - hour hand |
| 2E200700XN14 | others - dial |
| 2E200770XN13 | others - dial |
| 2E20554075 | others - case |
| 2E20554079 | others - case |
| 82731990 | others - case ring |
| T070AS | others - push pin |
| 2EG040LABDS | others - minute hand |
| 04V05DSM | others - minute hand |
| 1CA022A3BNG | others - hour hand |
Caliber 2E20
