1983 Porsche 956-110 21 August 2018 1983 Porsche 956 Group C NOT SOLD 1983 Porsche 956 Group C, chassis no. 956-110, estimate $5,250,000 to $6,750,000 Auction: RM Sotheby’s Atlanta 2018 Matthew Howell © 2018 Courtesy of RM Sotheby’s