Mid Century Trefoil Art Glass Bowl Signed

Interesting art glass bowl in triangular shape. Transparent aqua glass over opaque white glass, with three "windows," one at each of the three pinches in the sides. Rare impressed glass mark on the base which we were unable to photograph, but have sketched for you. Three S's between elongated ovals, all within a 6-sided shield. About 5-1/2" corner-to-corner, and 1-1/4" tall. Excellent condition. $9 US Shipping.