Subject:Re: Identification Please For Blue and White Chinese Kangxi Qing Baluster Vase
Posted By: Bill H Tue, Jul 04, 2017
According to information gleaned from Google, Tzen Wen-Hua was a Taipei/ROC diplomat active in the late 20th-early 21st century, including as Taiwan's unofficial representative in the UK as of January 2002. In a "Taipei Times" article of the day, which was cited by Wikipedia, "the 66-year-old Tzen Wen-hua (鄭文華), (was) set to retire from diplomacy soon".
Your translation of the apparently stamped mark is correct, but there is no reason to think the vase bearing it is other than contemporary with the time of Tzen's service as a Taiwan diplomat. Before and after Beijing began replacing Taiwan in international organizations, its diplomats virtually never left a newly made foreign acquaintance without presenting some sort of gift or memento of the occasion. According to Google results, Hammargren apparently was a politician and former Lt. Governor of Nevada who fell into a financial bind several years ago and was forced to sell a substantial eclectic collection he'd assembled and had on display in a Las Vegas museum.
The mark on the vase is nothing that actually appeared on porcelain made during the Kangxi period (1662-1722). On the other hand, China did produce and export porcelains tailored for the Japanese Market during the late Ming and early Qing period, so your vase could well be a copy of something in this category that is in the Taipei Palace Museum Collection.