This is a chrome-plated, commemorative Ayrton Senna helmet.
This is a special edition to honor the legendary Brazilian’s career. Senna won three Formula 1 World Championships with McLaren.
The helmet is chrome-plated and includes Senna’s design with his iconic colors. It was made to commemorate the 30 years of Senna’s F1 debut in 1984.
You can see more details about this helmet here.