Those are the only picts provided in the auction showing the proofs...if that's what they are (??), and nothing said in the description about them.I don't think Colt ever did that. Probably some GI ordered one through the local rod and gun club in (maybe at a base in Germany) hard to tell without better pictures. Anyway the host country laws may have required proofing at import.
I know this thread is a few weeks old but I just discovered it and want to thank Harry_Callahan for posting this link. It was the key to my interpreting my Python's proof mark. I found the exact marking.