DC and I had coincidentally been discussing how much of classic era Heuer design was the responsibility of Heuer and how much down to their specialist suppliers. We know Piquerez approached Heuer with the Monaco case and it's no great stretch to imagine the dial suppliers doing the same.

And it would be by no means fair to single out Heuer - the vast majority of the watch houses were supported by this cottage industry of specialist suppliers and most of the watches from the period are a collaborative effort to one extent or another.