Thanks for the website reference. It brought back memories of other dirt bikes that used to be around when I was a kid; Puch, Montesa, Bultaco among others. Harley Davidson even had a dirt bike, although it was actually made by an Italian company.
There's a wealthy guy in my city that has an auto museum and he has a bunch of antique and historic motorcycles as well. He's even got one of Evil Knievel's old Harleys. It's good stuff.