Circa 1938-1940: It is worth noting that the Harlequin yellow glaze is brighter than the more muted original yellow Fiesta glaze. Both popular colors, the yellow glazes remained in both lines for the entire production run. This example of the Harlequin yellow water tumbler is in excellent condition, showing little if any signs of use and no damage. Measures 4 3/8"h x 3 1/2"w