Swirl, also known as Petal Swirl, was made by the Jeannette Glass Co from 1937 to 1938.  It is mostly found in ultramarine, a pretty teal color, but it was also made in pink; and, a few pieces were made in delphite blue.  The ultramarine can be all the way from very green to very blue so make sure to specify which shade you collect if ordering by mail.  the 48oz pitcher was only made in ultramarine and is quite rare.  The butter dish is hard to find but not nearly as hard as the pitcher.   (We are sorry but we cannot email photos of each and every piece of glass for sale.   If you need to see a picture of an item to know what it looks like we highly recommend The Collector's Encyclopedia of Depression Glass by Gene Florence.)