As of 2010, more than six million people have seen the production.
One woman saw the production 800 times over 15 years at an estimated cost of £30,000.
Mostly these were one of a kind or in very small runs, but which never saw full production.
As always, the Detroit show had a significant number of the design studies that may never see production.
"This is the closest thing you can get to going to the Met, to see the production and not be there."
Many people who saw the original production remember it with great warmth.
However, the T44 never saw actual production beyond the one prototype.
Her Majesty saw the original production when she was 18.
Beers from both companies began to see production at the two facilities.
"If I played 30 minutes right now, you'd see production," he said.