What product had the first barcode stamped on it?

A barcode (also bar code) is an optical, machine-readable, representation of data; the data usually describes something about the object that carries the barcode. Traditional barcodes systematically represent data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D).

George J. Laurer is considered the inventor of U.P.C. or Uniform Product Code, which was invented in 1973. In June 1974, the first U.P.C. scanner was installed at a Marsh's supermarket in Troy, Ohio.

The first product to have a barcode included was a packet of Wrigley's Gum.