Hi,
I looked a bit through the online catalog of the Nationalmuseet, Danmark and every coin I looked at has the CC BY-SA copyright, which means we just have to link it properly (if we don't change them). An example coin page from them: https://samlinger.natmus.dk/kmm/object/137188
But I believe not all pictures in the museum can be used that way, but it could be the case for all coins at least. So could it be entered the same way as the Landesmuseum Württemberg for example (has the same copyright)? Selectable as a source, but not listed on the available sources overview page.
