[bigeasy1]

I have a 1974 23 Tsunami(aka sceptre),and would have to agree with most others on the price,but who knows,you can be surprised by the seller.
He may just want to pass it along and let it go for a low price,or think it's worth more than it is.I know this is a very broad range and not much help,but depending on it's condition prices in the 5-10 g range can be realistic.
It's a buyers market for sure so unless it's really in mint condition with a beautiful trailer i don't see it going for the high end of the range.
My 74 was shot,all the cores were rotted,all the wiring was shot and it was a total mess.the trailer was in great shape,other than tires.I paid 1,000 for it and sunk somewhere in the viciniy of 15-16 g's to totally restore it with mostly all new equipment except for the engine(I/0).
As for what to look for,it's the same as in the center console models.The transom should be give an extremely close inspection,as should the hatches,and blocks & tubes where the scuppers exit the deck.
Also the bow deck,If you have a bow rail on it check the deck for soft spots,as the screw holes can allow water to infiltrate the core,making it soft.All the typical other stuff like wiring,wet foam, etc.Altough mostly cosmetic,the long side window in them were mostly made with lexan which usually ends up spider cracking and yellowing.

Call me a Cynic,but I have this hard time thinking that boats of that vintage that are original don't have some rotted core.Make sure you check it out extremely thorough.
Let us know how you made out.