Very early camera lens (MAKE NOT KNOWN could be French), f12 possibly for Daguerreotype camera 1850? Focal length seems to be approx. 11inch

Overall length=89mm Rear thread is approx. 75mm

Optics pretty clean (will work well), slight signs of age and slight separation to very edge (will not impair image). Brass is nice, some signs of wear/age/slight corrosion.

The lens barrel is approx. 73mm diameter (down to 45mm where front cap fits).