This is a classic polychrome bowl by Margaret & Luther Gutierrez.  Margaret would make the pottery and Luther, her brother,  would paint them.  This bowl is a classic round shape.  It is fully painted with a water serpent (avanyu), which encircles the piece.  Note the complexity of the design as the bowl is turned.  Luther not only used a variety of clay slips but also painted precision and intricacy.  The bowl is signed on the bottom, “Margaret / Luther”.  It was originally purchased in 1973 and it is in excellent condition with no chips, cracks, restoration or repair.