I had a pusher reattached to my pre-Carrera at my watchmaker a couple of months back, and when I came by to pick it up, he had a gift for me.
From a yearbook a Swedish watchmaking magazine, he had found an ad featuring my exact model.
I didn't write down the exact year, but it was late 1940's, I think 1948.

Here it is:

The ad says (main part):
On your marks... ready... SELL!

Despite problems of delivery we've been able to assure [delivery of] a batch of Heuer chronographs, thanks to a previous contract.
The Heuer chronograph is known for it's exceptional accuracy - and it both shows and records time. It's a sale hit of the highest rank - now, be ready. On your marks, ready and sell!

The pictures on the side:
Upper) This is where you need a Heuer chronograph - it's both fun and exciting to have the race "in your own hand" and get lightning fast readings of the exact finishing time.

Middle) In interurban calls the Heuer chronograph is practical. The three minute periods can be "flicked", you won't forget time...

Bottom) In laboratory experiments and such, the Heuer chronograph has shown to be of invaluable use to scientists and engineers.

Here's a recent wristshot of my watch (which somewhere along the line had the chrono hand switched out).