How can this rushed McCartney signature grade a perfect "10" when there are so many better examples out there? I'd give this a 6 at best even though the whole idea of grading an autograph seems silly to me. Just another way for dealers to charge more and replicate the sports card grading industry.
I don't know one knowledgeable collector who takes autograph "grading" seriously. The grade apparently is based on how dark the ink is an how well it adhered to the surface.
I've seen "10s" in dark spots with almost no contrast as well as rushed abbreviated signatures.
BUT, they ink came out of the pen well... so they are 10s.
My favorite was a Buzz Aldrin AUTOPEN signed photo that was in a slab... authenticated and graded a 10. :-O