French Petzval 5X7 4X5 9" F5.6 brass lens with on Toyo lens board unknown maker
Classic magic lantern lens - fixed aperture at ~F5.6.
Focal length is approximately 8.5-9".
Total length of lens is around ~4" and glass diameter is ~1.6".
Will cover 5X7 at infinity.
Professional custom mount to a Toyo lensboard.
Glass generally clean, no major issues to report.
Unknown maker. Most likely a Darlot but no way to confirm.
Includes mounting flange.