Mysterious Autograph on Hank Mobley Roll Call Sleeve!

This is really funny and mysterious...

I got this copy of

At the back of the sleeve, there is an autograph. Initially I thought it might be Hank Mobley himself, wow!!

But...it is not Hank Mobley for sure. I searched on the internet if this could match his autograph. It was not even close...

Then I thought maybe, Freddie Hubbard...or Wynton Kelly,...Paul Chambers...or Art Blakey??

I really don't know...but if you look closely, there is a kind of illustration looking like a trumpet. That might be a clue...Just look at the close up picture here,

Any idea?

In case you can identify, share your thought!