NSX no. T000999 was given to Senna as a gift from his mentor and sponsor, Antonio de Almeida Braga, the seller claims, and it was stored at a palace near the Estoril F1 circuit in Portugal. He also was known to drive two other NSXs, a black one and a red one - the latter in which he was seen often.
The seller claims to have owned T000999, which is still in Portugal, for 17 years, and the 31,000-mile odometer indicates it was driven about 1,500 miles per year on average. Thankfully the car has been kept stock, so whoever buys it can enjoy driving it just as Senna did - that is, if the car actually is what it's claimed to be. If the story checks out, then this is one valuable NSX, which is reflected in the high minimum starting bid of 47,500 pounds ($73,620). There have been no bids at time of writing, but with nine days left in the auction, we'll be keeping our eyes on this one.
Senna is credited with improving the development of the mid-engine Honda when he told engineers after a test drive that the car needed to be more rigid. After eight months more chassis development, the car was stiffer and the suspension was finely tuned to Senna's satisfaction. The rest is history, as Honda stunned the world - and a few supercar manufacturers - soon after when it released the excellent NSX in 1990.