When a 1964 Ford GT40 Prototype crossed the block on day three of Mecum’s Houston auction, it took more than five minutes of relentless bidding before the hammer finally fell – and the number it landed on became the top sale of the entire event. This is GT/104, a genuine link to the car and drivers who later inspired Ford v Ferrari, with Ken Miles and Sebring 1965 baked into its history. So what does automotive perfection actually cost in today’s market?