The serial number gives you a little information to work with.
In the serial number 8BO18229, the 8B means the ball was poured in 1988 at the Baltimore plant. Not sure what significance the rest of it may mean, probably just a production number.
The “S†in the label means that, for some reason, the ball was considered less than perfect, or what is commonly referred to as a “second†as far as production quality is concerned.
The picture you have of the area that looks plugged, looks to be the “pinâ€, and yes, it looks to have been a factory repair. That could be enough to render the ball a “second quality†upon release for sale.
Those Red Pearl Hammers are pretty rare, and usually command a premium price.