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Posted By: davidcycleback

One thing I would add is that for photographic print to be a period photographic print, it should have no dot pattern and the paper should be very thin-- much thinner than the snapshot on your refrigerator. If there's no dot pattern and the paper is very thin, you're in good shape.

The thinness of the photo paper is a reliable dater, as the early photo paper was much thinner than later.