The appearance of this
PMD and the coins remaining in a group, suggests to me that these coins were likely prepared to serve some token purpose; a purpose that was never fulfilled. Perhaps, they were intended to be a host for a counterstamp? Coins having less detail remaining, typically due to wear from circulation, tend to better accentuate a counterstamp.
IMHO, interesting study pieces as these are, the asking price is way too high. I'd rather have some stamped ones!