On real close inspection, me thinks both chips may be the same. The one I thought was brown has a small amount of green in the diamond. Green may be worn off of BOB, leaving what appeared to be brown. I've emailed the young fellow,(better stop with the ole geezer thing )and asked if he has any more info. Will let you know if I find out any more.

The X has been stamped, not scratched, on both sides. I don't know why......yet.

Later.....Rick