I don't know (with regard to method of manufacture),
Nick, but the similar details - crescent, lettering, and such - across
seven coins listed simultaneously - and by a dealer with some notoriety - is enough to warrant some concern, at least for me. I have spotted occasional
Parthian die matches in the past, across dealers' listings and
auction catalogs. However, I've never, ever, seen this many
Parthians with such striking similarities sold as a group. I would certainly not touch them.