Here is a Bausch & Lomb Rapid Rectilinear brass lens from about 1880. The focal length looks to be about 4 inches. It is 1-3/4 long. The front and rear bezels are 40mm and the mounting threads are 44mm. I have no mounting ring for this. The aperture blades are missing.
There will be no bids accepted from or shipping to China or the Russian Federation.
Thanks for your purchase.