The hair itself looked unexceptional, dark with sun-burnished tips, perhaps 100 strands, wrapped in a piece of notebook paper. But when the final gavel fell Thursday in a bizarre auction conducted under high security here, the hair and the sheaf of historical documents that accompanied it sold for $100,000, the minimum bid.

The lock of hair on auction was taken 40 years ago from the corpse of Che Guevara, the famed revolutionary and cultural icon, by one of the men who had tracked him down and, after he was killed, buried him.

The lone bidder was Bill Butler, 61, a Texas bookstore owner and collector of ’60s memorabilia. After making the bid, Mr. Butler told reporters by telephone that Mr. Guevara was “one of the greatest revolutionaries in the 20th century” and that it was “a great feeling” to own the items, which he said he would display in his bookstore.