These Performance Center PC13's are from 1995. , and were billed by Lew Horton Distributors as a "Serious Carry Revolver".
Both are in my s/n 13....
The first one has the ports on the upper part of the barrel, a few weeks later the second one showed up at my dealer, the difference in the two is the location of the ports, the second one has the ports on the barrel rib near the front sight.
When the second one came in I passed, and another individual bought it. About a year later he traded it in on something else, and I decided that two with the same s/n would be great, since it's the s/n that I collected from the PC.