Hi, The dishes are to resemble a sailing ship, like Columbus sailed. Sleek and streamline, I only commented on two sailing ships as a pattern because of it’s popularity. It was Salem’s biggest seller. I think the shape is the same as Tricorne. Monagram is a pattern that had to be ordered a t the factory and was mainly made for restaurant’s and hotel’s etc. It was monagramed with the owners name or initial. The bar she found them must have served food. All I know about Margaret Blumenthal was that she designed this dish shape and petitpoint, Jonquil,and a bridge set with the suit of deck of cards on dishes. Viktor Schreckengost who designed most of the rest. Good for you in collecting these dishes, We need more of that. In short the sailing ships is only a pattern not a makers mark. Thank You and have a good day!