Roberto Rabanne; Courtesy of Guernsey’sOne of late Grateful Dead frontman Jerry Garcia‘s most beloved and iconic guitars, nicknamed “Wolf,” will be auctioned off on May 31, with the proceeds going to the Southern Poverty Law Center, a nonprofit organization that fights racism and hate groups.

New York City-based auction house Guernsey’s is hosting the sale, which will take place during a special event in Brooklyn, New York where musicians will also be paying tribute to The Dead.

Custom guitar-maker Doug Irwin made “Wolf” for Garcia, who played the instrument regularly in concert and in the studio from 1973 to 1993. It features a sinister, cartoonish wolf’s head with its tongue sticking out inlaid below its bridge.

Among the many famous gigs at which Garcia played “Wolf” were the Grateful Dead’s shows at Egypt’s Great Pyramids and the series of 1974 concerts at San Francisco’s Winterland Ballroom filmed for The Grateful Dead Movie.

The guitar’s current owner, who purchased “Wolf” in 2002 for $700,000 — not including commission — says in a statement, “I’ve been a fan of The Dead since I was a kid, and playing this iconic guitar over the past 15 years has been a privilege. But the time is right for Wolf to do some good.”

He adds, “My wife and I have long supported the efforts of the Southern Poverty Law Center, and if ever we needed the SPLC, we sure do need them now.”

Adds Guernsey’s president Arlan Ettinger, “Rarely, if ever, has there been an item as memorable and noteworthy as Wolf being sold to benefit such a worthy cause. Guernsey’s is thrilled that the return of Wolf will go a long way to combat poverty, racism and injustice across the country.”

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