The MC 39 was built by Markos Yachts - note spelling. I bought my first hull from Markos (he never used his first name which I found out years later was Van.)
IMO when he was in business he was the best builder in Vancouver - even better than Spencers. The MC 39's he built are extremely stout & well finished. He sold mouldings as well so Caveat Emptor. He built lots of the Maple Leaf 42's for Svends yachts. He also built the Perry designed Reliance 37 which was built and marketed as a very high end boat to compete with the very best. I never heard anyone say it failed at that goal either. They remain very pricy but rare.
The 39 is based on an Al Mason design and would make a very nice long distance boat or liveaboard.
The last time I saw him was in Coal Harbour - he & his significant other were finishing offshore prepping his own 38' "Daniel K" which AFAIK
was the same as the 39 but scratch built - possibly the plug.
Some time later I saw it was for sale in Florida and he was writing for GOB magazine.
One of the local race boat builders, when I mentioned I bought a hull from him, asked "Is he still building that big whale?"
referring to the 39 - I don't think you can expect exciting performance from it but lots of comfort & security for sure.
Are you looking at the one with the windshield? It looks like his construction from the pics.
Edit: just saw your link - that's the one I meant. If those pics are current it's a steal at the less than $50K you might offer. It's a lot of boat.