Heisey Whirlpool #1506 was produced 1938-1957. A major pressed tableware pattern made only in Crystal and Zircon (shown). Most items are marked with the "Diamond H". In the later years the name was changed to Provincial. Special note: If the item color is not Crystal or Zircon then it was produced by Imperial.
Imperial Glass Corporation continued production under the Provincial name from 1957-1980 in a large array of colors. Some of the early production carried the "Diamond H" trademark.
