I'm probably late to the party on this, but I was wondering what happened to that company.... They made some great throwback jerseys, and I was able to pick up both of these Southland Athletics 100% Nylon durene coated tanks. I suspect these may have came from HR Derby,
However the sellers couldn't confirm where they were purchased from, other than the label. One seller told me it belonged to his dad (the #40 gold one). He had been a Rams fan since the Cleveland days, and had collected a bunch of Rams items over a 50 year span.
The other seller (the blue #19 Jersey) stated it had been sitting around the house since the 70's.