The Seiko W620-4400 is a watch model based on the W620 movement.
Parts List
| K00P05L20A | crystal - crystal (inorganic) |
| 0F270BAA1 | case back gasket - case back gasket |
| F0P8AZ | band - band |
| W620440079A | others - case |
| W6204400 | others - case back |
| W620440079B | others - case |
| A150BS | others - push pin |
| T180BS | others - push pin |
| 82836970 | others - case ring |