Flaps and Seals Kit

1960s-1970s, U.S. Intelligence

Sometimes a written communication can be hidden in plain view. Secret writing insures that only the intended recipient will find and translate the message. Writings can be in code, or can even be invisible. The “wet system” uses invisible inks that appear when exposed to heat or chemical reactants. The “transfer” system simply involves carbon paper. “Flaps and seals” work is the secret opening of mail—by steaming open an envelope, separating the glue or using water to break the seal.

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Additional Objects

One-Time Pad (Silk)

Circa 1930-1940

Tobacco Pipe Pistol

Circa 1939-1945

Ring Guns

19th Century