the lens is goerz double anastigmat U.S.P. 635472 TYPE B series Ib No 4 FOCUS 9 1/2 the opening of the iris is 2.0 inches in daimeter does anyone know anything about this lens I cant seem to find it anywhere the aperture scale starts at 1.8 and goes to 256 but the iris is very damaged

any info about this lens i can get would be very cool
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