I think this is the largest Buehler Diesel Duck out there. It has been for sale for a while, starting at more than $1million a few year back, and now asking $500k. i have always thought this model looks really good, and would be a fantastic boat to live on and see the world!
2009 Buehler 71 Power Boat For Sale - www.yachtworld.com
It was built in 2009 in Turkey by Asboat yacht Building Asboat Yacht Building - ?zmir / Turkey
It's a lot of boat for the money, or does it have issues that have prevented it from being sold?
The boat only has a 150hp engine, which seems somewhat small, so not sure if performance is an issue. Hull speed should be around 11 knots, which would required around 260hp. I calculated this using Boat Speed Calculator
which may be simplistic but at least gives an indication.
Also looking at the photos the dark blue hull, which looks really good in the early photos, looks somewhat faded to a much lighter blue Below is a photo of when the boat was launched.
Assuming there are no significant issues with the boat, I am thinking that with a bit of TLC this could be good buy, and if it is underpowered you could afford to repower the boat, and the engine room has more than enough space!