Whilst I looked into the trade I decided to look at their Adrenalyn cards from booth series'. I managed to find a Extra Signature of Peyton Manning on Panini's website. I've tried looking everywhere to find out how to get it but I have not managed to find anything. If you look at it it says "ESPM" where the card number usually is. Below is a pile of both their Adrenalyn Cards besides Peyton Manning's series 2 base and ultimate cards. If you notice, both Tebow and Manning are the only two NFL Adrenalyn XL players to have a special extra signature.
Base, Ultimate and Pre-Production
The unknown Extra Signature (I want one)
Base RC, Panini 50th anniversary RC and Base
The Tebow Extra Signature