The Seiko 4206-521B is a watch model based on the 4206 movement.
Parts List
| SQ0W01LN00 | crystal |
| 40MC5NS1 | crown - crown |
| FH2830B01 | case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
| SQ0W01LN00 | crystal |
| 40MC5NS1 | crown - crown |
| FH2830B01 | case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
Caliber 4206
