I don't think using the London Bridge brand violated any agreement with Britain, but rather, was an additional way to identify figures he produced-along with the fact that they are solid-cast-as distinct from original Britains toy soldiers. Because there are a lot of solid copies of Britains toy soldiers out there.
I do know of an original set that Ron produced. It was a set of figures timed for the Bicentennial in 1976, depicting figures from the Revolutionary War. If I remember correctly, Ron said that they were sculpted by Jack Scheid. They were sold at the Liberty Bell museum in Zion's Reformed Church in Allentown. That's where the bell was hidden for a time, after the British occupied Philadelphia, and Washington brought elements of the Continental Army to Allentown and Bethlehem. I've never gotten to see the figures, though. Ron still had the molds but hadn't cast any in years. Randy may have them; I'll have to reach out and ask him.
Prost!
Brad