Diamond or Laced cover golf ball with raised lines. Only the 2nd example we've encountered. The first was sold by Bonham's Auction and described as "believed to be the only one made or at least to have survived." Well, we know this isn't true because of the offered example. Whether this is one of 2 that have survived, or if there are others out there, it is still an exceptionally rare, large golf ball that most have never seen before. Unknown maker.