I'm not an Oriental porcelain expert or anything, but the marks look Japanese to me. They bear a certain resemblance to 'dai nippon' marks which translate to Japan. Usually Chinese porcelain has four or more characters in their marks plus makers marks. Are there any other marks? I have concerns about the date 1792. It well may represent a design number rather than a date. It was not the usual thing to date the piece with European numerals during that era.
Also are the two opposite faces the same?