Marking within a square, or kaku mark: This is oftentimes indicative of Kutani porcelain, which alone covers five eras. Kanji resembling a "pi" symbol over a house: This.is a generic mark, but it's also related to Kutani porcelain. Crossed Chinese and Japanese flag with Turkish moon mark: 19th century A. .
The marks on these pieces should be symmetrical, square and even. Each mark should be of equal size and precise. Become familiar with marks from other Asian porcelain. Marks on Chinese porcelain pieces are even and regular, while marks on Japanese porcelain will include an odd number and may be in different colors.
If carefully studied they offer a great help in identifying the date and maker of most Chinese porcelain. Offered here is an attempt to identify some of the marks on mostly late, trade and export quality porcelain.