Based on the very sparse information you have provided, if I were selling this boat, my initial asking price would be "please take it from me; it's free". If the trailer is serviceable, it's worth far more than the boat. I'm not trying to be snotty, but the boat looks terrible in those pictures, and you haven't given any information on its condition. Let's try this a different way: assuming it is a 24' boat built in 1972; assume there is a functional rudder (not in the pictures); assume there is a boom (not in the pictures); assume it doesn't need new rigging (can't tell from the pictures); assume it has workable sails (again, not in the pictures); assume it has no significant deck delamination or hull blisters (can't tell from the pictures), and finally, assume the trailer is roadworthy. My best estimate of a opening price for you to claim would be $2000, but you'd settle for anything over $500. If any of the above assumptions (except maybe the rigging, which you could replace on a boat this size for a few hundred dollars) is incorrect, then I'd say the boat is worthless. There are just too many boats newer than that in better condition; its a buyer's market. Very few people will want to sink time or money into a boat this size when they can buy a fully functional one for the same price.