was wanting to sell this folding prop but have no idea what to ask for it any ideas

It might surprise you what people will pay. When I put my new prop on I had two old props I thought I would put on ebay. One similar to yours, the other my old Gori two blade geared folding. My old Gori got about $150 but a bloke paid $400 for the old ungeared one. Could have knocked me over with a feather.
A brand new Gori exactly the same as the one I paid $1300 new sold on ebay for $200 a few months after I had fitted mine.

so if i was to ask around the $400 mark would be a fair price.
thanks morning bird for the input

Not really what I meant. I meant put it on eBay and you might be surprised what you will get.
The style of prop you have there are pretty useless but somebody might want it.

i actually already have a guy interested he owns a s & s 34 aquilla he was wanting to buy it and i had no idea what to ask for it do you think $400 is fair for both

Do you know its diameter and pitch? If you do and it is what he needs it might be worth it to him. A new one will be about $1400 but it will be geared and have a long life. I reckon a fair approach would be he pays what you want, but if it is useless on his boat he can return it.