Normanity There is NO catalog of values for coins dated before 1600 - not that is up to date, in the English language and easily located anyway.
In practice, I see about 1 of these a year coming through the shop in North Carolina. They are typically sold for $5 each (to ME) but at that price they would hang around a long time at the shop - as they have in the past. (I think I have gotten 7 in just that way and I have been here 8 years). Demand for most foreign silver material is near zero at prices over spot and most silver coins hit the melt bin. I can and do still get high grade 8R coins for under $30 (melt plus profit for the shop). It is just too bad I can not save all the coins from the melt bin and take the time to find homes for then.
I am a part time authenticator and I attribute foreign coins (when requested)for a dealer in NC.
To find out if this is in fact a "rare" date means finding some collector or society who specializes in the series and who is willing to disclose what he (they) knows about them. That is a tall order - I have never run into anyone who does more than I do which is to put them aside as curious. I never let a hammered coin go to the melt bin except Islamic material with holes.
Price for any coin is a combination of rarity and most importantly DEMAND. Therefore I suggest that Hungary is the place to search for collectors of this series which will require an understanding of the language. Most texts that are specific enough to identify rarities by date will NOT be in English (usually German - possibly French - but NOT English) - that is a guarantee based on 50 years of collecting experience.
I would bet that if you focused on this series for 20 years - you could become a WORLD renowned Expert on the type. I don't see people lining up for that job.