Hmmm... I've seen his number posted on FR, along with Kerry's. This is something I'd really like to have an accurate answer to.
I don't know when President Bush signed up for the National Guard, but he is about my age. The lottery for the draft was implemented while I was at the Air Force Academy. I recall the approximate date because my number was in the high 300s, which meant I could have left at the time without getting drafted (I stayed).
Unless memory fails me (quite possible..), the first draft lottery was in December, so that would put it in December 1970.
So... When did President Bush sign up for the National Guard? If it was 1971 or later, then I suspect the FR info was right. If it was 1970 or earlier, then the FR info was probably wrong. Since he is about my age, I suspect the FR info is right, and President Bush DID have a draft lottery number, and it was over 300.