I didn't stop to scrutinize the picture but took it at face value and thought it was worth sharing. The best information I have found on this is where the picture originated: Photo Credit: Compton’s Pictured Encyclopedia and Fact Index (1947)
On another note before someone else brings it up. When this photo was posted to FB in 2012 it started a debate on the timeline being in the wrong direction, meaning 550 should be the outer most ring and 1891 should be in the center. Personally, whether it goes from inside out or outside in makes no difference to me and I'm certainly not a Dendrochronologist, I just thought it was a cool picture.
It is my "big" crash 15th anniversary in turn 1 of Thunder Hill Raceway in Northern California, I was fortunate to have someone taking pictures. After I healed up, broke right arm, I repaired the bike drove it for 3 more years and sold it.
Fat man on a little bike! My first lap warm up putting...