Tennisplayer.net's new issue has settled the issue. There is not only a clear picture, but a discussion with Peter Breskvar, the son of the coach who taught Becker the serve. It is halfway between an Eastern forehand and Continental, it apparently is useful to players with a strong wrist. Peter has taught this same grip to his 18 year old son Gregor who uses it on the Challenger tour. It is interesting how many "expert coaches" posted here through the years that this was just a myth due to some fuzzy photos shot from a poor angle.