I wasn't too far off then. How do you tell the imitations?
It's the style and the fact that BHL is an extremely rare mint signature for Sasanian drachms. And these particular countermarks, which don't appear on any other issue (foro does, but not with this letterform style). BHL does not necessarily denote Balkh, btw. And there are other "mints" in this imitative series: GD and what looks like GL; AHM; BYSh (I think); H (very stylized); and then BHL written as BHY, BBY, etc. And the pellets: one, two or three pellets on the reverses at 6h (single pellet reverses known on early H4 drachms: ST year 2; GD year 3) There is one example known without the countermarks (and there may be others). tom