Your memory serves you well...
Quoting from the hardbound Magic Inc. edition, page 363 J. B. Bobo wrote:
"The Japanese magician Ishida Tenkai, who once resided in this country, taught me this beautiful little trick quite some years ago. It is included here because it makes use of a technique known only to a few of today's coins (sic) workers."
Was he writing in 1964 or 1952?
He then goes on to describe the effect saying that the coin is "held between the third and fourth fingers in the Goshman Pinch"
Further, he claims on page 359, in the description of The Goshman Pinch that, "...it was evolved by Mr. Goshman and it has been used by him and a few others for a number of years"
According to Sol Stone (on his DVD Quick and Casual Close Up) Tenkai taught his pennies routine to Ed Balducci in 1937 who in turn taught it to Stone in 1945. Stone evolved his own handling using a different back clip technique after that point.
From what I've read Goshman wasn't really even into magic in 1937 so it seems unlikely that he has any claim beyond independent invention.
That's what I know from the sources at hand...
What you describe doesn't sound like what I normally associate with Tenkai. What you are describing sounds like Sol Stone's own technique or perhaps the "Deep" back clip I associate with David Roth. The word "center" throws me because Roth clips just back of center and Stone seems to clip closer to the tips of the fingers.
In every description I can recall of the Tenkai and Goshman back clips they are the same. Which leads to an interesting speculation about what Bobo meant or thought.
Did he believe that the clip was Goshman's? If so the "technique known only to a few of today's coins workers" may have been the hand to hand transfer of a coin during the display and not the method of concealing the other coin behind the fingers.
I can't imagine that he would think Goshman invented the clip especially since he had seen Tenkai use it as well.
Tenkai lived in the states for a time. Did he speak English? If not perhaps Bobo never understood that it was his origination. I can see him swapping tricks and showing the master something with the back clip only to have Tenkai show him something different with the move and assuming that the transfer was what he was being shown.
Or, perhaps it's simply a case of Bobo using the phrase that people knew just as you still hear folks say "Kaps Subtlety" or "Erdnase transformation".