A PAIR OF DUTCH DELFT GROUPS OF COWS AND MILKERS, painted in colours and naturalistically modelled in relief with large standing cows decorated with floral garlands, the horns yellow, with smacking red tongue, beside a male milker wearing a green hat and a blue vest, seated on a stool, a bucket between his legs, on shaped green plinth covered with frogs, the bevelled sides marbled, both marked van Duyn in overglaze red, circa 1750