The Seiko B004-5020 is a watch model based on the B004 movement.
Parts List
| ES5W49LN00 | crystal |
| 40MF7NS1 | crown |
| 40MF7NA1 | crown |
| FE188BAA1 | case back gasket |
| EB0055B0A | others - crown and stem gasket |
Other models with the same movement
| B004-4000 |
| B004-400A |
| B004-5000 |
| B004-5009 |
| B004-5010 |