Hi Nordlicht
Very, very interesting info you provided in the conversation (and most sorry I didn't see your message before now!)
It can be concluded, that the Visby archive is mentioned by name as early as 1959. And Arnholtz more than indicates, that usage of the four non-SKJBK SH-ESRs has been known, at least since the 1940's - and so, also the finding of the archive.
Funny detail, that the ESR-ABILD stamp was considered genuine back then.
So I basically see two possible scenarios:
1. Höyberg sold the archive himself, before his death in 1919.
2. The archive was sold after his death between 1919 and the 1940's.
As of now, I would guess option 1, based on the actual content is generally removed, leaving only the letter fronts.
It's fair to assume that the archive has been quite fragmented over time.
Still to my knowledge, is the 128th auction the largest single-outlet of Visby material - and therefore possibly also the largest and most representative "set of data", to say something about the statistical distribution of covers/singles/skilling/SH.
One of the aspects of the Visby archives that intrigues me the most, is what it contained.
I have never found any indications that there should exist a full inventory list of the archive, so we'll probably never know better, than an approximation.
Could I ask you to count the number of Visby-related Skilling issues and the number of SH-issues offered in the 128th catalogue? Any addressed to "Visby Hedegaard" instead of "Visby Mølle"?
Cheers, Ole