Subject:Re: Porcelain bowl question
Posted By: Martin Michels Wed, May 09, 2018
The mark displayed here is certainly not "Made in Nippon". It is the seal mark of Kozan 庫山 Gama 窯 from right to left. Yours is upside down, so see my included picture.
Kozan Gama is founded in 1971 and is a house brand of the Maebata China Corporation, Tajimi City (Gifu), Which itself was founded in 1963 and is still in operation today. Mainly producer of modern Japanese tableware for export to Europe and USA.