S.T. Dupont Line D Medium Blue GuillochéThe S. T. Dupont Line D Medium Blue Guilloch fountain pen combines classic styling with the best of modern engineering. Meticulous machine engraving and hand assembled components combine to create a writing instrument of enduring beauty and reliability. Our complimentary nib tuning ensures that your S. T. Dupont fountain pen will have writing qualities equal to its appearance, and these 14k nibs also make an excellent starting point for many of our