My father is trying to sell his 46.6" Bertram. It is a 1978 in decent shape. The Detroits still run strong. The interior is dated. Dad is getting older and can no longer maintain the boat the way it needs to be maintained. He is selling it for $75K. It is listed by the brokerage firm Knot 10 Yacht Sales. Please give it a look. The boat has been in the family for over 20 yrs. I can answer any questions you may have.
http://knot10.com/brokerage
Thanks,
Tom B.