You don’t really need any more information than that, but if you must, here’s what the eBay seller says:
This is a limited edition McDonald’s brass Big Mac belt buckle. On the back it says Limited Edition and Copyright 1975 McDonald’s Systems Inc. It is still in very good condtion.
Ah, the ’70s, when we loved fast food so much we wore it on our belts, in brass. It’s wonderful and also deeply, irreparably horrifying. [eBay]