Difference Between 573 And 573A

I really had a hard time. Sometimes the color is in between especially for used ones. In the following photo, could you tell which ones if any are 573a?

Colors can be deceiving, especially when viewing on the computer/Internet. If I had to hazard a guess, I'd say possibly the third and fifth in the second row and the second in the third row. The reds appear more rich and deeper than the others, but it is difficult to tell. The only way to know definitively is to have them expertized.

Thank you.

Here is one from Anthony's. LOL

https://www.ebay.com/itm/US-Stamps-...AOSwhuxatFNq

@rogdcam This is a tough call.

Yes. It is hard to judge.

Factor in sun exposure over the years and the stamps transforms into something else.

Jack Kelley

Very difficult to tell from an image, but to me there are two that look plausible: The 2nd stamp in the bottom row, and the last stamp in the 2nd row. The others look too "carmine" and not enough "lake." Even the two I identified may not be 573a's. Comparison with a known/certified reference important - I have some very deep carmine 573's in my reference collection that could easily be confused with 573a but won't cert as such.