Many items were marked, of course, but they were "prestige" items - European china for example - where the manufacturer and importer thought the source was a favorable selling point.
Obviously any item marked with those names is recent.
By the 1970s, most of the novelty gee-gaws were being produced in Taiwan or Korea.
But increasing prosperity in both those countries also moved them into higher level production so by the late 1970s, the major source for such items moved to Hong Kong.
But as the Japanese economy developed and grew more robust, their production focus changed from friction motor lady bug toys to the automotive and electronics industries.
That opened opportunities for other countries which had previously had virtually no trade relations with the United States.