McDonald's is celebrating the 50th anniversary of its iconic Big Mac in a big way.

Starting at lunchtime Thursday, customers at 14,000 participating restaurants across the country will receive a MacCoin with the purchase of a Big Mac while supplies last, the company announced in a news release.

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From Friday through the end of the year, customers can redeem a MacCoin for a free Big Mac at participating restaurants.

The coins have the following five designs, each paying tribute to a different decade:

  • The '70s MacCoin's theme is flower power.
  • The '80s MacCoin pays tribute to pop art.
  • The '90s MacCoin has bold, abstract shapes.
  • The '00s MacCoin focuses on technology.
  • The '10s MacCoin honors "the evolution of communication."

According to WPXI, the iconic burger was created in the Pittsburgh area by franchisee Jim Delligatti.

“When my great-grandfather Jim Delligatti invented the Big Mac at his grill in Uniontown, Pennsylvania, he just wanted to make his local customers happy,” said Nick Delligatti, fourth-generation McDonald’s owner-operator and great-grandson of Delligatti. “August 2 would have been my great-grandfather’s 100th birthday, and I believe he would be very proud knowing his humble sandwich has made such a lasting impression that people all around the world can enjoy it wherever they find a McDonald’s.”

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