You Must Remember This...

From the New York Times
The letters of transit — “signed by General de Gaulle, cannot be rescinded, not even questioned” — were hidden under its unusual hinged lid. It is golden yellow with touches of green and gold, a surprise to people who know it only from its black-and-white adolescence. It has a wad of chewing gum in a place where a wad of chewing gum really should not be.

It is the stuff that dreams are made of.

It is one of the most famous pianos in the world, the piano Ingrid Bergman was close to when she delivered one of Hollywood’s unforgettable lines: “Play it, Sam. Play ‘As Time Goes By.’ ” It is the short little upright from Rick’s Café Américain in the movie “Casablanca.”
Signed by General de Gaulle? A Vichy France official would let someone through with papers signed by the leader of Free French Forces?
The line is "signed by General Weygand", who was a collaborator in the Vichy government, Took me about 1 minute on Google to find the clip of Peter Lorre saying it.