As a general rule the plain CHINA mark came into use after 1891 when US federal law required all imports to be marked with their country of origin. The addition of MADE IN was required from 1919.

How do you date old China?

Tips for Determining TypeHold the china up to the light. According to Noritake, bone china will be significantly more translucent than other types of porcelain. Examine the color. Noritake also notes that the color of bone china tends to be more ivory than white. Listen to the piece.