I bought this a while back attributes as a pfennig from Abbey of Selz. I can’t find a match online, there is one fairly similar piece on numista that I will link below. If someone can confirm or correct the attribution it would be much appreciated! I’m not sure that there are any English language reference books that would cover this coin, but if there are, please let me know. Thank you. https://en.numista.com/catalogue/pieces109772.html
You may want to post this on the Ancients forum. I believe that your attribution is correct but there are more collectors of these on the other forum.