Definitely a Kadey-Krogen. I think it's the "50 Open" model.
I was touring a KK52 yesterday at the Seattle boat show. Across the dock was a Selene 55. Weird thing was that despite the Selene displacing 30,000 more lbs, it was bobbing like a cork at the dock, vs the KK wasn’t doing so bad.
Must be a difference in hull form.