This is excellent. I've run into all these different forms of umlauts in various old Scandinavian and German manuscripts. I concluded that, yes, they are indeed

This is excellent. I've run into all these different forms of umlauts in various old Scandinavian and German manuscripts. I concluded that, yes, they are indeed just umlauts, so if transcribing in latin Script (for German anyway), use an umlaut. The grammar made that clear enough. But I never knew the typographical history as to why there are so many different forms. So very cool that we can trace the lineage to specific printers.