I will add that there's no such thing.
There are Colt Commanders built in the 1970s, but none of them were "Series 70".
Great pistols, to be certain...but often mis-named in internet conversations.
That is incorrect. They didn't introduce the FPS till 1983, and it's not like Colt had JUST started producing commanders. Unless, the two Colt commanders ("S70") I used to own were fake.