The reference 5513 was introduced in 1962. The early 5513 Submariners came with gilt dials, such as the present example, and in the mid-1960s Rolex began using matte black dials. The inside case back is stamped 5513 III.64 meaning it was produced in the third quarter of 1964. This particular example features the "Bart Simpson" coronet due to its shape similar to the head of Bart Simpson, who is a character from the popular animated television program, The Simpsons.