That is an original Boston Whaler Yankee Voyager. Whaler bought these hull molds from Hi-Liner and produces a few hulls and then sold the molds to one of their dealers, Nauset Marine.
These hulls actually have a ride quality that is like a Bertram of the same size. How? Well the the Hi-Linner 222's (what later became the Yankee Voyager) were designed by Raymond Hunt.
The Hi-liner 222's came in a number of configurations. Sportsman, Gypsy, Adventurer and Swinger. It was the Gpysy model Whaler decided to make the Yankee Voyager. Why, I do not know...the Sportsman and Adventurer were much better looking boats.
The one in the ad you have linked to has been for sale for 2 years now and has gone from $10,500 down to $5000 Canadian. That boat is the most preserved Vankee Voyager I have ever seen on the market. For a collector, it is a steal...
http://geoffdevine.com, has these Hi-Liner flyers....

