Updated

Jerry Garcia’s custom-made guitar named Wolf is headed to auction.

Guernsey’s auction house in New York City announced on Friday that the Grateful Dead frontman’s guitar will be offered on May 31 at Brooklyn Bowl, a bowling alley, restaurant and music venue.

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Proceeds from the auction will go to the Alabama-based Southern Poverty Law Center, a non-profit organization founded in 1971 that serves to “combat hate, intolerance and discrimination through education and litigation.”

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The guitar is being sold by devoted Deadhead Daniel Pritzker. The philanthropist, musician and film director first purchased the guitar in 2002 at Guernsey’s for $790,000. It could exceed $1 million this time.

Jerry Garcia 1 AP

The auctioneer said Wolf first appeared in a 1973 performance the Grateful Dead gave for the Hells Angels in New York.

Garcia played Wolf everywhere, including San Francisco’s Winterland Ballroom, New York’s Palladium and Egypt’s Great Pyramids.

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Jerry Garcia 3 AP

The 1977 film, titled “The Grateful Dead Movie,” was directed by Garcia and featured Wolf.

Garcia, an icon of the 1960s psychedelic music scene, died in 1995 at age 53 from a heart attack.

The Associated Press contributed to this report.