Volo Auto Museum will host an online, no-reserve auction on November 9th featuring the heavily armored Rolls-Royce that carried Diana, Princess of Wales, and Prince Charles during the princess’ first-ever visit to the U.S. in November 1985.

The Rolls-Royce Silver Shadow is thoroughly documented to be the United Kingdom’s official embassy car, it features a 275kg, inches-thick windshield and nearly equally hefty rear window. Side windows, also bullet-proof, are sealed against possible toxic gas exposure, and the exterior trim is fitted with intercoms.

The car is valued at roughly £1.2 million by the Berman Museum of History and a portion of the sale of the car will be donated to CHILDREN with CANCER UK, Britain’s leading children’s charity dedicated to the fight against childhood cancer, which the Princess inaugurated in 1988.