Just to clarify, The LOA is from Mill Creek / Coast To Coast and is signed by Rodriguez.  

The Jersey is a Russell Athletic size 48, 95 year tagging, 100% polyester tagging and 2" extra length. The #3 jersey is inscribed in black sharpie on the back, "Alex Rodriguez #3, Game Used Rookie." The jersey shows moderate game use and has a 75th year Negro Leagues Commemorative Year patch on the right arm and on the left there is a Seattle Mariners patch. The high quality, oversized signature (2 x 41/2 ") rates a 9.5 out of 10 making this a truly outstanding find in the world of sport’s memorabilia. Accompanied by a Mill Creek / Coast to Coast LOA signed by A-Rod himself!