Elvis Presley Signed 1957 5 Pesos Mexican Banknote W/LOA - This 1957 5 Pesos Mexican banknote is signed by Elvis Presley. The lot includes a letter of authenticity which states that the note was acquired from the Eddie Hammer Collection. Eddie Hammer was a writer for Goldmine and Discoveries magazines, and was considered an Elvis expert. At one time he had what was believed to be the largest Elvis Presley collection in the world.