Honolulu 835.5 is a special case among precancels. It was thought that one collector made about 100 different denominations when it was in the post office, but only one copy exists on each denomination. Therefore, state 'general' collectors for Hawaii [a very popular state], need every one for their collections - hence competition. The recent
ebay offerings suggest that a second copy of denoms is out there and being sold. Since at least a hundred copies of Honolulu 835.5 are suspected in existance, even a 50$ catalog value might appear 'generous', but supply/demand dictates price. They have been selling for over 100$ on
ebay recently.
There are probably no more than 2 of these 835.5 Hatteras's in existance.