Well, if it really is a Boy Scout Diamond Jubilee knife, its not from your great grandfathers time. The Diamond Jubilee was the 75th anniversary of the founding of what we know as the Boy Scouts of America. That happened in 1985 in case anybody is counting. Limited edition in this case means 1 of 20,000 made. Its worth whatever you can get for it on Fleabay, no more, no less.