The WW1 repros came out in carbona blue, in the first run. As I recall, it was limited to 3000 pistols. I read that Colt had the carbona blue done by a restoration shop, as they don't have equipment for that finish now. These sold well and were considered more accurate as repros than the WW2 1911A1 repros (markings internally, etc.)
In looking at several of them at the time they were on the market, I noticed 2-3 that had a color mismatch between slide and frame. Others
were perfect. Friends I've known who shot them reported they were very accurate and reliable.
They then did a second run of them, this time with rougher finish and black oxide, meant to mimic the 1918 "Black Army's" in which the polish was lowered and the finish not as good. This kept them from exceeding the promised limited production numbers of the original Carbona blue first run.
The chief complaint on these was that Colt didn't polish the slide flats after stamping to clean up the "puddled" metal from stamping the markings,
as was done on the originals. Several years ago, I saw one NIB sell for
$1600. No telling what a good, NIB Carbona Blue repro in the box with all accessories would sell for now, but I have a feeling they will continue to rise.
All the best,
John