Maybe the 5-10-15 is similar to the 5 & 9 in a ring game. The 5-10-15 would be great fun as a ring game. That would get some hoot n hollers outa the sideliners
Great find, I've always thought that 9 ball originated in the early 20's/late teens. But my only source was a story from Minnesota Fats unfortunately, which of course cast some doubt on the idea. Nice to see solid proof.