A LITTLE HELP ON DATING PORCELAIN, POTTERY, DINNERWARE

Here are some ways you can tell the age of your piece
The Mckinley Tarriff act of 1891 required that the name of the country where the ceramic was originally made must be printed on each piece, sometimes country names were used as part of the mark before 1891, below are dates of the earliest marks using the country name as part of the mark.
China: c:1900
Czechoslovakia 1918
Danmark(Danish for Denmark) c:1850
Denmark C:1890
England 1880
Finland 1897
France 1867
Germany 1885
Hungary 1935
Japan 1921
Norge (Norwegian for Norway) 1911
Norway 1935
Portugal 1835
Sweden 1935
Switzerland 1906
United States of America 1935
Below are some terms/words usedon piecesthat cangive you an idea of dating if they appear on your piece, These areby no means all the terms or marks used on items but are some that can help
Nippon(Japan) 1891-1921 After 1921 The United States did not recognize the name Nippon any longer and that is the year Japan started being marked on items.
Bone China: Not used as part of a mark until about 1915
Copyright: After 1858 to present, The earliest the whole word was used is 1892
Copyright reserved After 1876
Delft 19th-20th Century
Detergent Proof C:1944-Present
Dishwasher Safe After 1955
East Germany 1949-1990
Incorporated c:1940
Limited(Ltd) After 1861
Made in Occupied Japan 1945-1952
Oven Proof After 1933
Oven Tested c:1935
Oven-To-Table 1978-Present
Patent Applied For 1902-Present
Patent Pending 1940-Present
Patented 1900-Present
Reg. U.S. Pat. Off. C:1932-Present
Reg. Rd. Registered with a number 1884 Present
Registry Mark Diamond Shaped 1842-1883 English designation that indicates a design or process has been registered
Semi-Vitreous(s-v) After 1901
Trademark: After 1862 usually after 1875. Word used on English pieces after the Trademark act of 1862 used on United States wares after 1875
22 carat term used after the 1930's
Underglaze C:1903-1945
Union made 1930's
U.S. Patent After 1900
U.S. Zone U.S. Zone germany 1945-1949
West Germany 1949-1990