Wow, thanks for the pix. I found some other good photos here.
http://www.landofborchardt.com/holsters.html#bulgarian
It looks like the Bulgarians made a lot of variations over the years. It's odd that most of them are unmarked.
Like I said above, I haven't seen any holsters I would consider "fakes" (although I don't doubt they exist) but I have seen a lot of well used, poorly stored re-dyed post-WWI holsters and a lot of WWII "era" holsters of mediocre quality that I think were probably made up into the '50's, maybe even '60's and many of them appear to be unissued but again poorly stored.
I bought a couple of "WWII" models a few years ago for $30-40 and I see the same holsters going for $100+ now. I don't know if that's being driven by interest or scarcity but it's a pretty good increase in "value".
Maybe someday someone will write a book about about these un-loved holsters, in the mean time I keep my eyes open for interesting variations.