Circa 1937 to 1938: To find turquoise nesting bowls with inside bottom rings is a treat, since turquoise was the last of the original six glazes developed, not available until the summer of 1937, and inside bottom rings were removed from the bowl by the end of 1938. Add that to fantastic, unused condition and this bowl will take your breath away. It's got all the bells and whistles, nice even glaze that is the brilliant blue collectors love, a fantastic shine and a smooth, glossy finish. Please note a pair of sandbumps on the inside, above the band of concentric rings (shown in the 7th picture at about 3 o'clock), there is also one small shallow sand bump or possibly ding that is 1/32" near the same area, very hard to find. But there is not a scratch on the inside and this bowl saw no use, so it's just a show stopper. Impressed in the mold with the early mark "fiesta HLCo USA". Measures 7 11/16" w x 5 1/16h"