Silverstone Auctions Ltd Lot soldUSD 411 - 548GBP 300 - 400 (listed)EstimateUSD 411 - 548GBP 300 - 400 (listed) See all lots "The 911 Turbo". Silverstone Classic Sale 2018 | 21 July Summary Lot number 343 Location Description Guide price: £300 - £400. <p>The Porche 911 (930) Turbo. An original acrylic on canvas painting by Tony Upson. Framed, 94cmx94cm.</p>