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Antique Extra Rapid Portrait 5x8 Brass Lens.
I can't read the model name from the barrel, only "Extra Rapid Portrait 5x8".
The front glass has fungus on the edges but is clean in the middle, and has no scratches, the aperture blades are stuck, I didn't try to open the barrel nor force the aperture, hopefully it can be fixed with a CLA. Front of the lens is 4.5 inches large, lens is 6.5 long.