Topgun, somewhere in my files, I have a list of Parker guns, serial numbers included, from Atlanta Outfitters. Among those guns were the .410s you mention, including an A1 Special. This was a couple of decades before we copied the Parker records and no mention was made of any of these guns being upgrades. I have intended for years to compare the serial number of these .410s with known Parker serial numbers, but have not done it. I wonder if these guns were Otis Odom's .410s? I believe he had a good relationship with Robert Runge and Larry Del Grego Sr. Bill Murphy