Resawing sycamore I hit something hidden in the stock, turned out to be a lead ball between 1/2 and 3/4 dia. went back out to the waste I had cut off and very unscientifically counted/estimated the growth rings at 172 for the tree and the ball was about 20- 30 rings out from the center. I hated to loose a band but is an interesting thought wondering about that ball and it's origin, circa 1850's in what would have been a very wild SW Wisconsin territory.
EJ