I recently purchased a Barrel lens and waterhouse stops to use on a speed graphic. It is about 180mm. It has the letters E.R.R. and 6 1/2 x 4 3/4 inscribed on it. I understand that the numbers may designate full frame but the E.R.R. stumps me. There is no other inscriptions anywhere. Could there be a meaning to E.R.R.? besides error?
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