Wanamaker's "Wonder" golf ball appears to be much like Worthington's "The Wonder Ball." It's quite possible that Wanamaker was trying to keep up with their competition. Wanamaker's Wonder is not listed in the normal golf ball reference books, so it would seem to be on the very rare side of things.  Both balls have a recessed diamond pattern cover and are great collectibles. Of course, an example in its original wrapper is even more special.