X-Men 100

I have always felt that issue 100 is the toughest of the three X-Men 30 cent price variants.  Because it has a white cover and issues 98 and 99 have black covers, I think that X-Men 100 is generally found in higher grade than the other two issues.  Anyway, this is a very nice copy of the book for $455 and they don't come around very often so it is not surprising that this is a record price for this book in this grade.  The last time that this issue in this grade sold was five years ago in 2007 - so these are pretty rare.