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barrysloateDan- Corey's assertion that the measurement is among the most important things to look at for determining authenticity would probably be true 99% of the time.
If for example we found the first known N162 poster (no such thing exists) it would be fair to say that maybe it would be larger or smaller than an N28 poster. Therefore, its measurements might not be a good test.
However, N28 posters do exist and they measure 22" x 16". The chance of a variant N28 poster being found with different dimensions would be extremely unlikely. Not impossible, just very unlikely.