I have a martec folding prop that is very very lightly used, in great shape. here are the specs, 3/4" bore, RH 12d x 12pitch. I also have two extra blades that fit the same hub. these blades are 12x6. If you are interested please PM asap. I can send pics.
I just took a look on ebay... many folding props of different sizes and pitch. When I first repowered I put on fixed two bladed 14X12 RH on a one inch shaft. After some ebay shopping (it took a while) I picked up a Martec Eliptic 3 14X10 RH folding prop. LOVE it. Picked up about a knot in sailing speed.