Hélio Courvoisier S.A.

Hélio Courvoisier S.A., or just Courvoisier', was a printing firm in Switzerland that specialized in photogravure printing of stamps. They produced many, many issues for countries around the world from 1931 to April 2001. Courvoisier was celebrated for its high quality.

Stamps produced by them typically have "COURVOISIER S.A." printed in the bottom margin. Noticing this "signature" will give you some idea of just how many different stamps they have printed.  File:Ruanda Urundi flower.jpg 

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