Mio Amor IV is a 1960 Riva Aristion. This is a rare, unusual and gorgeous craft.
It was a recently restored by Macatawa Bay Boat Works. The link below is a very complete pictorial of the hull process. The hull framing and hull siding work is meticulous. I believe it is owned by a Detroit GM professional.
Riva Restoration 1960 Riva Ariston
The stories of discovery and restoration of these woodies are fascinating. You can spend hours with each owner learning so much.