The unified country used "Made in Germany" after 1990.The American occupation of Japan lasted from the end of World War II until 1952.
Because they are easily removable, many Japanese items must be relegated to the unmarked category." Use marks to date pottery and combine knowledge of marks with the style and shape reflecting fashion trends of an era.
Flowing fancy designs of Art Nouveau were typical prior to 1920, when angular square shapes became fashionable.
This act required that country of origin be marked on all imports. Changes enacted to the Tariff Act in 1914 required the words "made in," followed by the country of origin.
According to Harry Rinker, a noted authority on collectibles, marks were not required on individual pieces of a set. Items imported after about 1914 should be marked with this additional information. The 1921 changes to the Tariff Act required countries to use the American spelling of the name.
Dating pottery and history intertwine as the pottery marks reflect changes in import and export laws established by the countries.