IMHO and as above... be very, very careful with this boat. Reading between the lines in this ad (40 year old wooden mast
...easy to repair) makes me suspicious as it has others. The similarly constructed old Newporter 40s down here in SoCal are great boats if you can find one that isn't rotting from the inside out and that is not always an easy thing to spot. They tend to rot from the caprail down where the edge of the ply is.
There is a gorgeous ply under glass Thunderbird over in Sab Pedro but you can just barely see the bubbling of bad wood under the slick paint
job of the cabin
These boats need a lot of attention to remain healthy.
My own boat is balsa cored above the waterline and some fool installed a small through-hull w/o protecting the core
just before I bought it. The first thing I did was pull that nonsense apart and inspect... fortunately it was dry but you can imagine what would have happened if rot had taken hold.
Ask very specific questions of the owner, try to get a clear picture of how concientious and repair savy he/she is and crawl over every inch of that boat and up the mast
with a little awl or screwdriver...
Better yet, give it a pass.