This was in a box of projection lenses I bought. I didn't know what was there, until I disassembled a strange aluminum fixture. Thought it was junk. It looked like a movie camera lens fixture or maybe something to take pictures of scientific stuff. The fixture had a 4 screw, square flange and some alloy pieces that rotated. Heck, for all I know it's off a U-boat periscope.
Anyway, I started unthreading and finally found there really was a lens in there, under quite a bit of oil. I wiped the rim with a q-tip, and saw:
C.P. Goerz Berlin - Dagor 1:6,8 12cm
It has a nice working aperature, but really isn't in a barrel mount, too much exposed machining.
I mostly shoot wetplate, 4x5 and up. I do have a Speed Graphic that could perhaps fit this. Yet, I don't think the rough collodion process would benefit from what I hear is a great lens. Is this a great lens? Will I kick myself if I sell it, perhaps if I later move into B&W film? Would it make some money so I could get that Dallmeyer I'm wanting!?