Swa one a fgew years back at Berthon called NRK. From what I remember, balsa cored hull, superb aft saloon - this may not have been a standard layout. They were I believe built in Marseilles (or somewhere down that way). CN stands for Chantiers Navale (ie shipyard), "SO" is presumably the name of the yard (as it happens my boat was built at Chantiers des Ardennes in Marseilles).
Berton may have some specs. We really liked the boat but didn't want balsa core hull.
Good luck.
There are a couple for sale on the web. e-mail mailto:info@abyacht.com for details or do a search on "Mikado boat" in Google
Have a look at this guy's <A target="_blank" HREF=http://www.yachtsurvey.com/structuralissues.htm>boat surveying</A>website; Some of what he says is a little extreme, but I happen to agree with what he has to say about cored hull construction.
If the cored laminate is only above the waterline, that's fine; just make sure there is no delamination or badly done repair work which might indicate water penetration.
If the entire hull is cored, I wouldn't even consider it, there are too many ways for it to go wrong in very expensive ways.
HTH,cheers,
David
<hr width=100% size=1>What in the wide, wide world of sports is goin' on here?