For many months, there has been an endless stream of Mariano Rivera signed items with Global Authentics / Steve Sipe certificates. There are 20 - 30 of these on eBay at any given time and they all look strikingly similar. Here are a few examples of Global Authentics / Steve Sipe certified Mariano Rivera items:
Can anyone produce known authentic exemplars that compare well to the items above?
Just for comparison's sake, here is a ball signed through Steiner Sports: