It's probably hard to explain the 2 year rule. If that is a criteria the graders actualy use then it follows that they would have to know when a photo was taken as well as when it was printed, on most photos a non-starter right out of the gate. To me you can't take photos and try to shoehorn them into a tight category like a baseball card even thought it is natural to want to do so as we do it with all manner of other things.
I love photos and buy them occasionally, I normally disregard any mention of Type 1/2, etc. bc to me most of the time it is an informed guess and sometimes not. If it is dated on the back that is great but you are also taking a leap of faith that it wasn't added later as well. Heck I have some photos with multiple dates, I am assuming they must have dated it each time they used or ran it?
It is an interesting niche.
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