Brilliant, on both counts!
re the hammered, there has been so many monyers and dies, across so many cities, with Bishops and emergency coinage, etc., etc., that new varieties are appearing all the time!
However, mostly, with hammered, it’s still grade and eye-appeal that remains king, and it appears that most people pick that up quite quickly, unfortunately!
One caveat to this is of course finding something in the ground that’s historically unknown for a mint or king, then you might be on to something…this seems to happen quite frequently with the early medieval period.