This Autographed 4.15x5.75 Cut Signature has been Personally Signed by Eric Clapton & Jack Bruce of Cream. This item is 100% Authentic, it comes slabbed and authenticated by Beckett Authentication Services.The authenticity can be verified on Beckett Authentication Services website. Press Pass Collectibles only offers Authentic Autographs by Eric Clapton & Jack Bruce through Signings, In-Person Signings or Private Collections to include a 100% money back Lifetime Authenticity Guarantee.