I think I know what you are thinking. Unfortunately, the stamp was identified correctly. It is 7R2. I actually have a 7R2 in a strip of three on
ebay right now if you want to see another. Of course the one on the plating archive has way better margins but a poor impression in comparison. I think you got a fair deal. As for the pinhole, isn't it just missing color? If there was a hole we could see the brown cover beneath.