The Seiko 1E20-5A39 is a watch model based on the 1E20 movement.
Parts List
| SAHN19HN | crystal |
| SAHN19HN01 | crystal - crystal (inorganic) |
| 27N03NA1 | crown |
| 0F115NA1 | case back gasket |
| 0F115NA11 | case back gasket - case back gasket |
| DZ0040B0 | case back gasket |
| M5053D | band - metal band |
| M5053D-LKG | band - link |
| M5053D-PB1 | clasp - parts for buckle/clasp |
| M5053D-BK4G | clasp - clasp |
| 04L21JGH | hand - hour hand |
| 04V29JGM | hand - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 81181459 | others - bracelet fixing pipe |
| 81611459 | others - bracelet fixing pin |
| 1E200C40XN14 | others - dial |
| 1E205A39 | others - case back |
| 1E205A39J9 | others - case |
| 82821630 | others - case ring |
Caliber 1E20
