Good question, but I can't give you an answer, sorry. I also have a set like the ones in the first picture. I got mine years ago from either Broadway Approvals or Frank Godden Approvals in London, England. They likely cost me a buck or so.
The stamp you've shown are from Hamburg not Hanover. They will always have some value. The first group does look like it's a reprint on newer paper. But I'll need to do some home work on that!
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