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Heinrich Wieynck's magnificent Kanzlei is embedded here (page 8) and here (top), but neither gives any info as to who's selling the digital version today. I've checked all the usual suspects, and none of them seem to have it. I wrote the both the Stempel guy and the Klingspor Museum but got no response from either. In both PDFs it's embedded simply as "Wieynckanz."
Any information about who sells it would be appreciated.