This is a SIGNED Sinclaire bowl in perfect condition.  The pattern is deceptively simple with cuttings, intaglio etchings and a bubble rim typical of Sinclaire's designs. I couldn't get a clear picture of the acid mark in the center bottom of the bowl, but it's there: a wreath surrounding a script "S".  This American Brilliant Period bowl is free of chips, fleabites, or scratches.