CHICAGO, Illinois - McDonalds is creating it's own currency to celebrate the 50th anniversary of the Big Mac.  

The company is celebrating the 1968 national launch of the double-decker sandwich whose ingredients of "two all-beef patties, special sauce, lettuce, cheese, pickles, onions and a sesame seed bun" were seared into American memories by a TV jingle. 

In 1967, Michael James "Jim" Delligatti lobbied the company to let him test the burger at his Pittsburgh restaurants. Later, he acknowledged the Big Mac's similarity to a popular sandwich sold by the Big Boy chain.

Starting Thursday, August 2nd, customers who buy a Big Mac will receive a special Mac Coin. 

The coin is good for a free Big Mac.  You can redeem the new McDonald's currency for a Big Mac starting Friday, August 3rd.