This year I bought [4] new "CZ" Colt 1911's, a blue Classic Government, stainless Classic Government, blue competition and stainless competition.
They all have the bar code etched on the frame under the mainspring housing. Not sure but I think they started doing that when CZ took over.
I have bought Colts since the early 80's and these are the best, quality wise, I have ever had.