We believe this rare antique Rochester Optical Eastman Kodak large format camera reduction film back was intended for a 5x7 camera to be reduced to 3 1/4 x 5 1/2 film pack. We can't seem to find any information on it. There are a few scuffs and scratches on its exterior. Its outer edge is 9x9''. Both sets of pins are 7'' apart. the ground glass is 5 1/2 x 3 1/8. The receiving slot is 4 1/4'' wide. Please see photos.
