The Seiko W620-4390 is a watch model based on the W620 movement.
Parts List
| K00P05L60A | crystal - crystal (inorganic) |
| 0F270BAA1 | case back gasket - case back gasket |
| 86640155 | crystal gasket - plastic gasket for crystal |
| F0P7AZ | band - band |
| 82836970 | others - case ring |
| W620439079A | others - case |
| W6204390 | others - case back |
| A150BS | others - push pin |
| AD006BA11 | others - crown and stem gasket |