Kangxi pot shards are sometimes found on the Treasure Coast beaches. I've shown some examples in this blog in the past. I've also shown the mark that identifies such porcelain. That was not too long ago.
You can see a piece found on a Treasure Coast beach by going to the following linked post.
Sample Kang'Hsi Shard That Was Found on the Treasure Coast.
The spelling varies. Sometimes you will see it as Kang'hsi
Kangxi (4 May 1654 – 20 December 1722) was the fourth emperor of the Qing dynasty the first to be born on Chinese soil south of the Shanhai Pass near Beijing, and the second Qing emperor to rule over China from 1661 to 1722 (Wikipedia)
Sotheby's will be auctioning the Kangxi seal shown below.
Bearing the inscription “Revere Heaven and Serve thy People”, the Seal of the Mandate of Heaven is the largest and most powerful ever carved for the Kangxi Emperor, the greatest and longest reigning monarch of China. The Mandate of Heaven is the philosophical tenet that Heaven granted emperors the right to rule based on their ability to govern and their righteousness and was used throughout the history of China to validate and legitimize the rule of the emperors. During Kangxi’s reign, the seal was at all times kept in the Palace of Ultimate Purity, where emperors entertained and a major venue for their policymaking...
Here is the link to the Sothebys video about the seal.