Nice pictures Glenn, I remember seeing 2 or 3 of those at Speculator a few years ago. It is unusual to have four of a very rare airplane all on floats in one place.
Years ago a classmate/friend of mine at East Coast Aero Tech bought one from one of the instructors which I had the opportunity to fly. I remember going to the Dracut airport with him to look at it before it was delivered to Marlboro. It was N32590, I often wonder where it is now? It's not on the FAA registry.