The humble postcard can be an extremely cost-effective method of advertising (particularly if it has a real stamp on it). We saw previously how a dealer could print their own cards.  But 75 years ago, Cornell Dubilier capacitors would supply them, preprinted with the dealer’s name and address, at no charge.  The dealer’s only expense would be a penny postage.

As you can see Cornell Dubilier was a forward thinking company.  When most people still referred to their main product as “condensers,” they had already adopted the modern name “capacitor.”

This ad appeared in the July 1946 issue of Service magazine.