What brand hot dogs did FDR serve the king and queen of England?

President Franklin D. Roosevelt famously served the king and queen of England, George VI and Queen Elizabeth, Hot Dogs during their visit to the United States in 1939. The brand of hot dogs served was likely the well-known brand "Hebrew National," as they were popular at the time and associated with American cuisine. This casual meal was seen as a way to symbolize the friendly relations between the two nations.