From Rolling Stone:

Clapton remembers first being struck by the Strat when he saw Buddy Holly with one, but he became obsessed when he saw Buddy Guy play one live. He started using them regularly after Cream broke up, using Brownie during the early Seventies and playing it on “Layla.” The guitar sold at a 1999 auction for $497,000 (the replica will sell for $15,000). “Touring with that in a quartet that was quieter, funky, very strong, all of it hinged on the toughness of this guitar.”