Guess...
When I was 9, Bill Auberlen (race driver) had just joined Team PTG and I had a poster of his M3 GTR rocketing around Summit Point. On the roofline where the driver's names [used to] go, there was the small American flag and then "B.Auberlen," hence J.Clark.
Now I have every Bill Auberlen/PTG poster I can find.
