Ok guys, I will snap some pictures later. But Tantal, most all (all that i have) Romanian barrels have this stamp at least in part, usually pretty poorly struck. Its not rare to find a Romanian barrel with the y stamp, its just rare to find it very well struck and obvious.
I have this stamp on a 1966 Md.63 take of barrel, a 1979 "G" build civil guard pull barrel, a 'virgin' romanian barrel with the trunnion journal stampings and partial y stamp that everyone thought were soviet barrels. And most conclusively of all, a Romanian AIMR/AIR carbine barrel in 7.62x39 that was a take off from a 1994 dated AIR/AIM carbine kit.
I highly doubt that the short, proprietary Romanian carbine had a soviet barrel. It has not been cut down from an AKM barrel, rather manufactured as is due to the obvious chrome lining of the crown area that would have been faced off in a cut/re crown. I encourage all of you to look really closely at your Romanian barrels, as i have not persoanlly seen one without at least a poorly struck partial of this y stamp. I believe it is simply the same stamp the soviets gave them to signify final proofing, and that the Romanians, all of their AKM equipiment/lines being soviet and all, are still using this soviet pattern stamp as well.
I believe that the "virgin" barrels are late/relitivly current (post 2000) due to a few things. One is the way in which they fit with the timeline of Romanian barrels. First came the standard Romanian AKM barrels from built military rifles. They have the same 'y' stamp, and usually no heavy lathe lines, and generally have journals that are not all out of spec with their concentricity like a lot of the 'virgin' barrels i have seen. These same barrels were used on the late WASR-10/63 rifles, having been pulled down in Romania from military AKM's Next came the strange semi-virgin barrels that were imported as usually complete units with a strange flaired muzzle nut installed, with virgin trunnion journal area. I believe these were overruns from the WUM series of rifles, as they fit with what these were made with. Next came the SAR production/take offs that matched the WUM barrels in all aspects of the barrel itself, save for the fact that the muzzle was never threaded from the factory, and is the propper dia or larger to be threaded 14mm, not turned down (these were made new for the SAR series and early WASR-1) Then finally, came the late 'Virgin' barrel, which had never been spotted or seen before the 2005 barrel ban, and i believe were made or imported strictly because they were only importable in that virgin configuration, to be sold as such and skirt the 2005 barrel ban on completed 'machine gun' barrels. The quality and construction of these barrels is also new to this post 2005 time frame, as well as the style of markings especially with regards to the journal number stampings at the rear trunnion location usually filled with white paint, roughness of handguard retainer broaches. These are the lowest quality Romanian barrels generally encountered, and have never been spotted in any actual AKM builds built in Europe, or at all anywhere prior to about 2005. If these were Russian, they would have other proofs that Russian barrels have, would not be of such poor quality (jacked up journals and things would have never made it to final y proof stamping/acceptance in any Soviet AK factory IMO), would not be blued identically to late Romanian Cugir products, and we have never seen a russian barrel with those strange journal stampings. The Romanians have not used theese on WASR-10/63's because they can use otherwise non importable pulled AKM barrels and parts on theese guns due to the configuration (sporting) that the rifles as a whole are imported in.
That is in long form, why i believe these to be late Romanian produced barrels. I will later snap some pictures of the above mentioned proofs, and check a Romanian 5.45 AIM-74 barrel that i have for that proof as well.