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This font is from Regiomontanus' calendar (we'd call it an almanac, I guess). It seems this font is a sort of compromise between blackletter and Roman, which maybe makes sense given the context.
I'm posting this particular page so you can see the old old-style numbers.
I know the font might not look like much in this picture. Some pages toward the end of the almanac are full of running text, though, and I think the look is kind of cool, but I can't really read German so what do I know.