The more I look at this, I have my doubts. I understand and agree that it may simply be a rushed version, but I don't think I have ever seen his signature stop at the "M", lift the pen and do the "squiggly" thing through the rest of the signature (if anything, it would be after the "M". I've seen some pretty ugly, rushed McCartney signatures but, if I remember correctly, never without his raised "T" in McCartney and certainly not his "E" style double "C". I'd have to see other authentic examples to be convinced. Anyone know of any ?
I agree with the majority - but not because I'm in the majority. It looks real, although very rushed, and, therefore, not very valuable. And, possibly, a tough sell in the future.
Having a Beckett letter does not mean it's quality, real, or sellable for a high price.