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I think your identification of the Meter 511 is correct.
Thanks for confirming. Actually, this could be only the "tip of the iceberg."
I think I have enough meter cut squares from the 1930's and 1940's in my collection that I could document enough material to do a significant update to the catalog previously posted (at least as far as LKU dates are concerned.)
However, I'm not a member of the Meter Stamp Society, and the reference in the catalog as to an electronic means to advise of corrections leads to a dead link. So I'm not sure how to advise the publisher as to any updates I may have (or if they even want to hear from a non-member about such things.)
It's nevertheless quite an interesting exercise and I find it absolutely fascinating to see how many different meter imprints were used through the years (and by whom) when, in the early days of meters, most were probably thought to be less than collectible.