Fede - I wish I had all my Romanian cartridges in 7.9 x 57 back. It might answer some questions, regarding bullet, headstamp fonts, etc.
With respect, I disagree with your supposition. I had, in my collection Romanian 7.9 headstamps with the headstamp “PA” dated from 1937 thru 1943. While the “44” date on the questionable steel-case “PA” 7.9 is 44, and therefore originally had me believing that it might be Romanian from that year, since I had never seen a “44” dated brass round from Pirotehnia Armatei, the “PS” headstamp is dated 43. If the steel case “PA” round is really Romanian, and made in the year represented, why would they have changed to the headstamp “PS” already known on ammunition made by an ally, the Slovak Republic of WWII which was aligned with the Axis, only to change back to “PA” in 1944? Further, if one has examined these two rounds in hand, as I have, they are identical to each other in manufacturing characteristics, so much so that for me, it begs the imagination to believe that they were made in two different factories, even in the same country. I will admit, stranger things have happened in the world of ammunition, but it is just one of many things that point to the headstamps on these rounds being spurious.
Further, whoever made them went to some trouble to make two different headstamps, and also to use very different font from each other on both of them.
I do agree with your comment that “these could be unidentified headstamps.” I have yet to find anyone willing or able to positively identify the actual maker and year of these cartridges.
Is it possible that they are Romanian? Yes. It can’t be said they are not because no one seems to know who really made them, including me.
Is it possible they are Slovakian. Yes - same circumstances as above.
Is it possible they were made in neither country (the bullet, as I recall, is very “FN” in appearance, and please don’t accept that as my identification of these rounds - I reiterate that I have no positive idea about who made them), but by someone else? I can’t rule that out at all, using any approach at trying to ID them.
As always, just my view on things. I have been right many times. Unfortunately, I have been wrong many times as well.