It looks like a Farrier, one of his early designs pre-dating the F- series that were designed to be built in ply. The TrailerTri 720 model would be just about 24 feet long. Farrier's designs are very highly respected here; they are supposed to be very competent sailing boats.
(Farrier Trailertri 720
They're popular here on Australia's East Coast
; they come on the market now and then and I looked at a couple of them (not this one) before I bought my boat
. If it's in good nick, it would be a good price
. But there's not much room belowdecks. Also, they're big on a trailer
and I wouldn't want to trailer-sail one, especially single-handed as the set up and tear down of the rigging
would be something of an undertaking.
Hope this helps!