No expert here.
Regardless of where you draw the line there exists an identity problem. Even if an image has a date written or stamped, how do we know that wasn't applied later to make it appear as a type 1. While I am unfamiliar with the detail, I am sure some degree (probably not much) of dating can be done using the photographic paper. I was simply suggesting that a 2 year window seems rather tight in terms of suggesting a photo taken in 1921 and printed in 192 is somehow more desirable or valuable than one taken in 1921 and printed in 1929. There is a whole hobby of photography collectors out there, perhaps someone should consult with them. My 2 cents.
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