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see the dots between all the 'T's' in the top stamp
Not looking at periods between the Ts. But the large circular red dot located as noted in the OP.
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On the first stamp it is located top center and in the second stamp in the upper right margin.
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They are both different overprints. I have the top one with and without the extra dots, and I have the bottom one without the dot. The dot on the bottom one is completely unimportant. When I shared that image with Parcelpostguy, I had not intended for him to post it. It was just a random image I came across when I looked for it on Google to see what it was. As you can see, it has a watermark over the image. The dots on the top stamp are what I am interested in knowing about.
Yes, I mentioned the second stamp image was a lift from the web (WWW). But as the margin dot is similar in size to the top center dot, I showed both. If one is picked up in a specialty catalog, both should be. So far the only answer to the red dots is the nail holding the plate (overprint mat) to a backing. That is a reasonable option but stall wanting is the answer as to if such dots are listed varieties.