Those "local revolutionary" overprints exist (many of them on Hitler stamps) but I assume there are more forgeries (including double or inverted overprints) than genuine issues. They are not listed in Michel catalogue. (not mine)
Thanks guys. When I didn't find them in Michel I was pretty certain they'd be fakes. I do have a 1955 copy of Yvert for Europe. I'll check first in there if more dubious overprints turn up. And by look of things, they will.
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