In the 70's it was 70's gloss but, gloss today is very blingy and the only trouble with satin is there is so many grades of satin. I do my early frames in semi gloss but, it all depends on the manufacturer of the paint.
I took to frames for paint some years ago somewhere near Bradford and asked, for semi gloss. When i went to pick them up , the paint looked like a matt black. All the painter said was, well it says semi gloss on the box