This bowl radiates joy--everything about it feels absolutely right, and it actually seems to glow! I believe it is quite an early example of Winfield Pottery, which was founded in Pasadena, CA by Leslie Winfield Sample in 1929. (Winfield later moved to Santa Monica, in 1946, and closed in 1962). While later pieces were made using molds, this bowl was hand thrown. It is made of semi-porcelain, and glazed a deep, mottled sky blue on the exterior and aqua on the interior--a striking combination.

The bowl is hand-signed on the bottom "Winfield Pasadena", with the number 10. 

It measures 5 1/2" across and 3 5/8" tall, and is in very good condition. There are light surface scratches and stains to the interior center of the bowl, consistent with age and use.