I have two gently used 16" diameter Brunton auto-props.
Both are in excellent shape and saw a couple seasons of use on my cat before I switched back to folding props and carried these as spares for the last few years.
Both are bored for 1" shaft with right hand rotation but they could be bored out for a larger shaft if desired.
Not sure of value so I am willing to entertain reasonable offers knowing that they are still for sale new at around $3000 each but that these are also not new props. You cover cost of shipping from Seattle or local pickup if you prefer.