Quite a few of those 100 year old colt's have suffered through the militaries idea of maintenance, and have been through multiple wars.they sort by caliber groups as well. 100 year old colts are not being sent back to colt today for warranty/QC issues.
Colt is extremely far from perfect, but even the sloppiest UAW botch job I've seen doesn't come close to the worst kimber I've seen