The owner has left the country and is trying to get it sold at any price.
What do you think it is worth as is.
I have a friend who has sailed to for a season.
Speaking as someone who is trying to sell a 1979 Oday 23 as I write (anyone interested?), I can tell you that the market in Connecticut for smaller, older sailboats is absolutely saturated. Last summer, my friend had to give away his 90's vintage 24' Beneteau (new Honda outboard, and a trailer!) as he couldn't sell it. He even tried to donate it and got no takers from among the many charities that do take boat donations. I've got my boat listed for $2500, and although I've had about 5 showings, there have been no offers. At this point, I'm going to either list it for free or try and donate it.
Which brings me to your friend's boat. Buyers interested in 25 foot boats are usually looking for an inexpensive way to get on the water. Your competition isn't the other boats listed for 50K; the competition is the other 23-25 footers. None of them are selling for more than about $5000, and that's with a trailer.
So, in my humble, yet expert and correct opinion, your friend's boat is worth about $5000. All of the upgrades and the goodies will likely make it one of the first $5000 boats sold, but that's the extent of their "value". Someone might even be willing to pay a premium to have those things; my guess is that they may pay as much as $8000 for the boat. But I doubt much more. I'm thinking back to when I bought my Oday 20 years ago; I was really frugal about the whole thing. It was my first "big" boat, and I was very conservative with my money as I had no real idea of what the ongoing costs might be. I passed up some slightly more expensive options (some Catalina 25's in really good shape) because at the time, I didn't think they were worth the extra 2 or 3 grand. That's the mindset of your target buyer here. As has been pointed out above, anyone who wants a "luxury" daysailer has a lot of better options at that price, and would likely shy away from a 50+ year old boat anyway.
My two cents (adjusted for inflation).