Comanche,....
I think they just may have been using old stock to make new pistols. These things can sit around for many years without being used , and still be perfectly good if they had good protective lubes on them. Armi San Paolo made some really nice, and authentically scaled '58 Rem replicas, that were a step above the Armi San Marcos. If you get a chance, slug your bore. I'd be curious what your groove diameter is. ASPs are known for having nice tight bores. I sent you an e-mail with more info,.....