Roy and Linda Dietz, who have been married for 58 years, wandered the floor of the Denver Convention Center on Thursday, looking over hundreds of vehicles at the Mecum auction. The couple had no intention of bidding on a car, but they were tempted. “We saw a ’64 Ford Falcon. It was our first brand new car,” Roy Dietz said. The couple recalled parting with their Falcon, after two years, because their family was growing. “We needed a bigger car,” Roy Dietz said.