The forester that pointed it out to be indicated that was what happens when the tree pollinates itself, it doesn't work well.  That's why there were no other chinese chestnut offspring trees in the area despite this tree being huge and about 100 years old.  I have not investigated to see what the nuts look like since then.  I did also plant several chinese chesnut seedlings about 10 years ago.  I have seen a few nuts on them and they are starting to come along, maybe 10' or so.  Hopefully I will have enough viable trees to have good nut production in the future.