Becoming clear

I don't think I've  got the answer to yesterday's question - where Ray's Chessgames.com notes to Keene-Basman originate - but I do know that the notes from the fifty-year-old game are at least forty years old, since they appear in Ray's Batsford compilation, Becoming a Grandmaster.

Here (with thanks to Jonathan) is the original.

I say "the original", but while that takes us back to 1977 at least. the notes in all likelihood are from before that year, because though Becoming a Grandmaster is a very entertaining read, it's notoriously a read of material that had been previously published elsewhere (this being an example) not that Ray or Batsford bothered to tell that to the paying customer.

So the hunt continues - where did the notes come from? Maybe Ray or Chessgames.com could tell us.