There is a saying in business. If it looks too good to be true, it probably is! I am talking about the perforated stamps of this set. The unused stamps of this issue are – with the exception of those, that were not overprinted – already really rare. Its more than likely that only one sheet of each denomination existed in the archives of Erivan and was later sold through Moscow. Not one of experts from Tchilinghirian to Zakiyan and Ceresa reported the existence of perforated stamps of this set. There is no document in the archives describing that those stamps were perforated. So of course it is not impossible someone made a handful of perforated stamps back then. But, how probable is it? Also, how can one attest the evidence of those? And last but most important: how hard is it to produce this super rare rarity? Probably much easier than faking a cover with cancel, overprint etc.
So sorry, but I am not buying this.