For 1971 - "I don't know." - changed to SEE BELOW.
One of the hardest things - as a stateside American - is finding clear photos of original rifles that show both the trunnion side and selector side of that rifle - the proof we need.
The earliest "both sides" rifle I have seen photos of was a 1966 Romanian. It had a sharp, thin font pointed A in the selector marks. It is the same set of photos that 74U LLC markings were based on. It looked like it was stamped with a machine stamp. RichardW sold a scrap Romanian receiver that was marked with this early style. Maybe he will grant permission for me to post the photo.
The flat A selector mark was in use for sure - both G and Md63 - from 1976 to 1978. The flat A marks have a wider font. Weaponmark had/has a scrap receiver with the flat A style mark. I've got an RPK scrap receiver with this style mark - but it is loaned out to a receiver manufacturer for study.
The thick font pointed A appeared sometime after that. Stott posted photos of that 1982 G with thick font pointed A. That style was in use for sure through 1991 - perhaps later. I have a photos of a 1991 Md63 with the same style markings. I have scrap receivers marked with this style. I'll post photos later or perhaps start a thread on it.
So that is three confirmed styles of Romanian military S FA FF markings out there.
1 - Thin Font Pointed A - early - for sure in use in 1966. Still in use by 1971 per Stott's photo below.
2 - Thick Font Flat A - for sure in use by 1976 - 1978. Not sure when this style started or ended, but for sure ended by 1982.
3 - Thick Font Pointed A - for sure in use by 1982 - 1991. Not sure when it started.
There may be more styles of S FA FF, but I've looked for a long time. So far I've just seen three.
If I had a 1971 kit I would go with the thin font early style pointed A. I plan to use that style on my 1964 Md63 kit. I built a barrelled 1973 Md65 with the thin font pointed A.
There are also at least 3 styles of Romanian S A R export selector markings.