I an beginning to wonder if it has anything to do with making shot for a gun of any kind. The depressions in the mold, the haves don't look to me like they would make a round ball, not deep enough, at the bottom, last hole, there is a small cannel like the ones that join the other cavities making another spru that would have to be cleaned up. All together a Lot of work to get then cleaned up and round enough to even use as Buckshot. Could it have used to make weights for fish nets?
Tim C.