Lance sent this picture of his uncle from the glory days of chop 'in.
It's a really nice home grown chop and swing arm chops are harder to do. Note the lowered shock mount on the swing arm. All work including the paint was done by his Uncle. Lance says it from the late 60's but from the looks of several things (like the bobbed shirt), I d guess it's more likely from around 1970-72.
I guess it's in the family blood. Lance has his own plans and says he'll build a Buzzard/David Mann inspired bike with this recent find.