Looks fairly rare, based on a quick check of ebay.
It will never have any real value (like the 1958 Herrer) unless it were to get added to the catalog, which won't happen.
Different, but similar, is the 1958 blue background Aaron.
http://www.net54baseball.com/showthr...ght=blue+aaron
You should keep it.
But if you sell it, let us all know,
Doug