Dating british glass backstamps
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.
These "prestige" marks will name the manufacturer as well as the country and are normally very elaborate looking things with lions and crowns and coats of arms and so on - all intended to impress the brash Yankees.
If you see a mark that simply says a country name it was made after 1890 for export to the United States.
Once the requirement for foreign origins was imposed, many American manufacturers also began marking their items with some indication of source to take advantage of "Buy American" sentiment.
Labeling then returned to the "made in Japan" form.
We recently found an item marked "Made in Allied Japan" which seems to date from this period.
From 1891 until 1949 their production was marked "made in China." but, because of domestic instability in China (the Boxer Rebellion, the Republican Revolution, regional Warlords, Civil War, Japanese aggression, etc.), there was relatively little trade with that country during that period.
From 1949 to the mid 1970s there were no trade relations with mainland China. production came to be labeled "made in Taiwan." Italy and France are both major sources of contemporary glass items.
Early chinese imports are unmarked or marked with chinese characters.
Other items have early style bail covers to seal them.