Starting production in 1905, the Expo was an American version of the European Ticka. The film was sold in a pair of cassettes that produced 20 pictures.  It was sold under a variety of names in various countries, and evolved over time with changes to the engravings, viewfinders, shutters, etc.  Some were even available in several colors in addition to chrome -- such as black, blue and green.  It was still being sold until about 1940.

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