Wish I could help but I have never seen an exemplar of his to go by. Is there another name on the back of the page? As a great fan of Erick Sykes I remember the giant Tommy Cooper from "The Plank." I also remember seeing him as a boy when he was on the Ed Sullivan Show in the late 60s doing a magician act and getting it wrong. The ballpoint pen looks right for the era he was in.
You say that, some people will forge almost anything, but yes see what your saying. to be fair it only cost me £9 off Ebay so nicely framed I believe I should make a bit on it hopefully.