Here is a side-by-side comparison of a rare aqua "square dome" California hoopskirt, CD 152, on the left. Note the larger, more squarish dome and the shoulders on the skirt. This is the standard mold type listed in the McDougald price guide. On the right, is the unlisted "taper top" mold variant in blue. Note the more slender dome and the lack of shoulders on the skirt. The blue taper top is much less scarce than the aqua one.