I have one of these also. I bought a Jackie Robinson How to Hit flip book a few years back, and this was included.
I am not sure if these came with the flip books or how these were distributed.
I have never seen another one. In my opinion it is a much rarer piece than the actual flip books.
On another note, I do not believe the How to Bunt book was ever made. I have never seen one.
Something else that is pretty cool, a few years ago I bought a proof page from the How to Hit book. It is about 50% larger and slabbed from Beckett.
-Jason
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