Found a guy selling these stones and claims that they are newly cut from vintage pieces of the same stuff vintage thuringians/eschers were cut from. So essentially they are nos, just in a round about way.

they are 8" x 2" x 3/4" or 20cm x 5cm x 2cm, so they are bigger than most all Thuringians I've seen and are less than the ones sold as new stones, with a slurry stone included. So I don't really know what to make of them.

Good or bad?
Worth the price for the size even if they're new?

here's the auction: http://cgi.ebay.com/2-Original-Thuri...QQcmdZViewItem