A DUTCH DELFT POLYCHROME GREBE BUTTER DISH AND COVER naturalistically modelled in relief, the cover as a grebe-type bird, (fuut or grèbe) the plumage in yellow, green, blue and red, with yellow tuft, holding its head with its beak to its back, the oval butter dish modelled as duckweed (kroos) marked for Petrus van Marum, de Romeyn, 18th Century