Set of 3 milk/cream/coffee pitchers model 503

These bistro pitchers were found a long time ago. They were used as decoration in my parents' kitchen. They are in very good condition with some marks from time. It is model 503 and they have three different sizes 7, 8 and 9. They are white earthenware on the inside and brown on the outside. The largest of the 3 must have been used as a coffee pot because the interior is more cream than white.