Boyd ebay weekly auction popularity contest winners: 1938 Ohio License Plate Number Tag – Sesquicentennial Northwest Territory has 28 Watchers – The plate honors the one-hundred-and-fiftieth anniversary of the Northwest Territory which was basically the state of Ohio at that time. The 1984 Washington License Plate has 28 Watchers. The 1918 Washington License Plate has 18 Watchers and probably has appeal because it’s over 100 years old!