Design for a Boat-Shaped Vessel, possibly intended as a Festival Float

It takes a village to raise an object. Here are the people who've been involved with this one:

• Previously owned by Pierre-Jean Mariette
• Previously owned by Count Jan Pieter van Suchtelen
• Previously owned by Hippolyte Destailleur
• Previously owned by Jean Léon Decloux
• Donated by Advisory Council
• Giulio Romano