Details on the "Int" books are very sparse, I did some research a few years ago and couldn't come up with much.
They're not a recognized pedigree, but the books usually are very nice (average VF).
Theory (and it's just a theory) is that they were issues destined for overseas via the U.S. Navy logistics chain. Whether they actually shipped to someone, if some copies were held back, etc., is anyone's guess.
I have always been curious if this is the INT OO's sig. I have not seen it on any other copies.
That's a new one on me, Andy - I can't read the signature too well, can you interpret what it says?
looks like Francis Furch
Given the different (I think) handwriting and pen v. pencil maybe the signature is of someone who happened to pick up this copy rather than the OO of the entire Int collection.
First glance impression to me was that the pencil mark actually denotes 'jul' for July.