Ok, I looked at my mags and they are from Checkmate.
I have to admit that I have been remiss in my firearms since my father passed in 2009. When I drove up to Spokane, WA to visit, I would bring 4 Winchester White boxes of 230gr ball … that's 200 rounds a piece. We had a lot of fun at this indoor range by him.
Anyway, the group buy was from Checkmate and "old guy" on the M1911.org forum mentioned that Brownells was selling Colt 1911 magazines, made by Checkmate. So, over a period of a few months, while I was waiting on the group buy, I bought 6 of those Colt mags. They have the Cold stallion logo embossed over the Checkmate name and they worked perfectly.