I know Anderson's association with ASM in the mid to late 90's.
The guns were in the USPFA era, when Donnelson was importing Uberti's.
I also recall, ASM's head guy was Aldo Uberti's son in law. So, it's not too much of a stretch.
Now that I think on it some.... I'm thinking it was the C&B Navies in the USPFA era, they are rare too.