(Radio.com) After a lock of David Bowie's hair sold for $18,750 at an auction in June, it seems likely that a few pieces from Elvis Presley's estate will also draw a high bidding war. Four major items from the King's estate will be auctioned off on August 13 at Graceland.

Among the items are his birth certificate, a guitar he often played throughout the 1950s and 1960s, the karate outfit he wore while working towards his seventh degree black belt and a still-working revolver, according to Invaluable, the auction house handling the items. The guitar alone is expected to bring in between $20,000 and $30,000. But recent auctions involving music memorabilia have exceeded their speculative bids and then some. The same auction that sold Bowie's hair (which was supposed to go for only a few thousands dollars) also auctioned off Prince's Yellow Cloud Guitar for over six figures.

The biggest item, however, will be Presley's birth certificate, which registered his birth in Tupelo, Mississippi as well as his twin brother Jesse's stillborn death. Invaluable, who will host the auction, estimates that document will sell for between $80,000 and $100,000. Read more here.

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