The helmet in question is a Bell helmet which Ayrton Senna wore during F1 testing at Paul Ricard Circuit in 1994, the year of his fatal crash. It is painted in colors of the Brazilian flag with logos for Bell, Nacional, and Rothman’s. This helmet was not worn by Senna during a specific race, instead this helmet was just used for a few laps. Auction house Bonhams estimates it will sell for between USD79,000 to USD110,000.
