The Seiko 5420-5520 is a watch model based on the 5420 movement.
Parts List
| RE4N02GN | crystal |
| RE4N02GN00 | crystal - crystal (inorganic) |
| 35N18NA1 | crown |
| 0G0055B0 | case back gasket |
| 0H1720N0 | case back gasket |
| 0H1720N01 | case back gasket - case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| B5114G | band - metal band |
| B5114C | band - metal band |
| B5114C-BK3G | clasp - clasp |
| B5114G-BK3G | clasp - clasp |
| T060BS | others - push pin |
| 05R14NGH | others - hour hand |
| 0354706 | others - winding stem |
| 54200980XG14 | others - dial |
| 54200980XN14 | others - dial |
| 5420552025 | others - case |
| 542055202N | others - case |
| 54209 | others - machine code |
| 82708760 | others - case ring |
| 05R14NGM | others - minute hand |
Caliber 5420
