DesertGold/Moorcroft: https://www.desertgold.us/moorcroft/Moorcroft.html
HIBISCUS Cobalt Blue Rolled-In Bowl Approximate Dimensions: 4.5" (11.43 cm) Diameter 1.125" (2.858 cm) Height 2.75" (6.985 cm) Base Footing Diameter Circa: 1949-1960s (an earlier hibiscus design)