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

Secret Cipher Ashtray

Circa 1930-1940

Eyeglasses with Concealed Cyanide Pills

Circa 1975-1977

Steineck ABC Wristwatch Camera

Circa 1949