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Yep I think your right I had Fast too and thats what they look'd like.I think I got it....
Those look like Gerard Karpik hydroformed FAST pipes.
I know at one time they would tack weld their "FAST" label onto the pipe, then after a while they were stamped "FAST"
The one's I ran (FAST) turned 8200.
...might not be, however those guys were about the first that I can remember that did hydroformed twin pipes back in the day.
I had twin Decker, Aaen and Wahl pipes for 670s in the past and they were hand rolled/welded (many) sections.
I know that black magic used to do hydroformed pipes back in the day too.