Circa 1937-1946. The Vintage Fiesta mustard was only in production for a short time and will prove hard to find, especially in excellent condition. The base and lid were slip cast and the lid was molded from one piece, just like the medium sized teapot. The spoon hole would have been cut out by hand after the piece was molded. The mustard jar went through many revisions before this final size and design were decided on and the piece was released at the end of 1936. This example of the original cobalt blue Fiesta mustard jar is in excellent condition. Unmarked, as all mustards were. Measures 2 1/2" wide by 3 1/16" tall.