I just bought a Voigtlander Collinear Series III No.4 and am trying to find some information on it. I have searched google as much as I can tolerate and have found very little about specs of the No.4.

It was made in 1899 according to the serial number and has "Voigtlaender & Son Optical Co" etched on the side. Its a f/7.7.

Does any one know the coverage, quality, mount size (shutters it will fit) or worth?

I found some info on allenrumme.com and grabbed a screenshot. Just not sure if the lens I marked in the shot is the one I purchased.

I am also attaching two photos of the lens.

Any help would be appreciated. Would like to see a catalogue or advertisement for the lens, but can only find the for the series II.