Brent,
I met Bob Roller one time at Friendship, IN back in the 80's but I really don't recall seeing one of his locks. I am certain I never saw one of his flint locks.
He was the only German speaker who spoke German with more of a southern accent than I have. Nice man and enjoyable to speak with.
James, I talked extensively with Bob back in the late 80s or very early 90s, about locks. He was winding down building them when he agreed to build me a percussion lock. He said people weren't willing to pay for quality. I have that lock in my shop wrapped in the same cosmoline paper he sent it to me in. Still perfect in the white.
The quality is unexcelled in modern times. I have some very good percussion locks by Schillinger, Siler and others but the Roller is like a Swiss watch.