This is a reply from Jason about this topic:
Hi,
The responses are correct for the most part. The location of the plant that manufactured the ball is in the serial number (Baltimore, Utah, or St Louis). If there is an S inside the bullseye for the CG location, it is a second/blem. I don't remember us ever using a B inside the bullseye though. I would be interested in seeing a picture of it.
Jason