HD back-stamps--Hand-cut from one sheet?
It appears that the red mark on Camnitz is just that, a red mark, not a printing mark.
I'm surprised that no one has really pursued Tony's hypothesis, that these SC 350's and 460's are hand-cut from the same sheets.
Maybe it's gone as far as it can go?
Are there any more of these HD back-stamps out there?
Or any other similarly cut SC 350's and 460's? [Possibly, particularly as we see no doubles, they could have been split up with other collectors.]
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