Butterfly Chafing dish heater

Bing & Grondahl Butterfly, Chafing dish heater with metal top. They were sold both with porcelain and metal top. The factory mark tells, that this was produced between 1962 and 1970. Decoration number 237. Factory third due to several, large dark spots in glaze, see pictures please. Diameter 12.0 cm., height 8.0 cm. Perfect condition with no chips, cracks or repairs.