I don’t have a camera that can capture the makers mark, but it is a raised circle with raised print. The inside circumference of the top half of the circle has: QUADRUPLE PLATE ON. The inside circumference of the lower half of the circle has: HARD WHITE METAL. Across the diameter of the circle: JOHN CARROW. Immediately below: PHILA.PA. A small star centered above JOHN CARROW and below PHILA.PA. Above small hole in the center, bottom: 300.
I would like to know more about John Carrow, the approximate date for the manufacture of this piece, what it was used for, approximate value and whether or not I should attempt to polish it!