This one is from a gun show bin and has a brand new appearance. Is it a recent manufacture?
If 40+ years is recent yes.
Is this headstamp not S.F.M * GG * ? (intertwined G’s.)
Yes. I was just very surpised to find a shiny new SFM round in the midst of old banged up falling apart dust covered ammo. Maybe it was taken out of an old box, so it looks new. If you saw that ammo discount bin, you would be surprised too.