I'm not that well versed on Clapton, but I have doubts about the printed example you pointed out, N.Steiger. The Crossroads, OTOH, is classic Clapton to me.
Steven, I agree with the others about the one you posted.
Hi Steven, this is not authentic, IMO. For reference, here is a Clapton signature I obtained myself in person back in May of last year. Hope this helps.