I received a very happy email from the Münster coin cabinet! There publicly stated policy is Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Germany License. This unlike Yale’s public domain images, or York and Dublin’s CC BY-SA 4.0 would exclude scholarly publications or at least some scholarly publications. However, upon inquiry they offer blanket permission for scholarly publications! There are 119 republican coins online now.
The ANS policy is very permissive as well and is probably the best choice for images for journal articles. However, they begin charging for books with print runs that exceed 500. And I at least believe one should be allowed to dream of larger print runs and even paperback editions.