Subject:Re: green chinese bowl with flowers and blue square mark to base
Posted By: Bill H Tue, Oct 15, 2019
Your sgraffito floral bowl is mark & period of the Qing Jiaqing reign (1796-1820). Its "minyao" (popular kiln) mark is shown resting on its righthand side. When flipped 90-degrees left, "Jiaqing" (嘉慶) reads down in the middle in a rude form of seal script.
You're correct about the impact of damage on value. The Chinese buyers who control the market are rather intolerant of imperfections such as this. However, it makes a good archival piece for use as a basis of study.
Here are some photos of a Jiaqing-period 9.5 inch dinner plate and a 7.75-inch Qianlong-era side plate, both reign-marked. The Qianlong mark is much more readable as "Da Qing Qianlong Nian Zhi" (大清乾隆年製), "Made during the Qianlong Reign of the Great Qing Dynasty".