Heisey Cabochon #1951 produced 1951-1957: The last major pattern made by Heisey before they closed. This plain design combines elements of both the circle and the square. While made primarily in Crystal, some items were available in Dawn and Amber. Matching stemware(6091) was available in Crystal only. This pattern was marked with the "Diamond H".
Six blown tumblers with Sultana bases(6091) were produced from 1952-1954. Being blown, these tumblers do not have the "Diamond H".
Imperial Glass Corporation continued to make most of the items in Crystal, including the blown stems, from 1957-71
