I do not believe that the chip on the Guide is a Cuban chip I have talked to cuban collectors and no one seems to think so either. This has been discussed here before. I believe it is from somewhere in SA like so many of the bone chips, Smitty posted one as I recall and we talked about on the board.

That Cuba attribution was made by a ebay seller a while back, somehow it went into the guide as so. I asked the seller at the time if he had any proof of his claim and he did not have any. I highly doubt it is from Cuba.