Definitely not a new book — Badger books is a nefariously bad late 50s and early 60s imprint — almost all of their catalogue was written by R. L. Fanthorpe (and under about 15 publisher chosen pseudonyms). He wrote each in about a week (check the sci-fi encyclopedia if you don’t believe me) for ~20$s each.
I thought that was Action Man for a minute, then I saw that the hands and arm joints weren’t quite right. I agree that this looks like a modern parody of old crap SF, rather than genuine old crap SF. The designer was clearly ahead of his time.
“Earthmen in name only?” Who the heck refers to themselves as ‘earthmen’?? If I was to refer to myself as a species, I would say ‘human’. Of course, I’m not an ultra-buff dude wearing super-tight polyester pants, so what do I know.
MBIS would be Member of the British Interplanetary Society and 2/- is another way to write the book price, two shillings.
I can’t recall ever having read one of his books, but from his webpage the man must be superhuman: journalist, headmaster, priest, TV/radio talking head, weightlifter, martial arts instructor, oh, and he writes books too.