Hi Stacyphi
Very pretty.
That’s a generic “Xiang Gang Jia Gong” mark (香港加工) used on export ware which is not attributable to a specific maker. The mark is read right-to-left for each of the two rows. My understanding is that it translates to “Hong Kong Final Process” and means that the decoration was added in Hong Kong, but the original fired porcelain blanks were produced elsewhere and could be either Chinese or Japanese. Our esteemed member “Yang Hao” can probably comment on whether I have the translation correct.
That mark is commonly seen on plates and dishes from the 1960s and 1970s when Hong Kong was under British administration.