serving plate stoneware base with sugar maple leaves and seed pods

I love this serving plate. My mother's cousin gave it to her in the 60's or 70's. The piece came from the St. Louis, or Southern Illinois area. I don't know where my cousin got it, but I feel she found it at a sale or shop. I love the art deco design on the handles with appear to be brass, the rim is copper. The bottom stamp reads Dec. 1657 and then there is a triangular with a 47 at the bottom. The pattern is so lovely and unusual. I believe it is a sugar maple with seed pods. I love the silvery blue color and the fine details on the leaves are in white the seed pods a soft camel brown. the circle around the leaves is a two tone blue and appear to be hand drawn. The handles are welded onto the cooper rim and there are sets of 3 triangle stamped through the cooper rim at 5-6 inch intervals. I love the use of the 3 materials and the art deco look of the handles.