The Mark Twain Crescent Filler fountain pen. In 1898, Roy Conklin invented and patented the self-filling pen known as the Crescent Filler, and now it is recognized as the world’s first practical self-filling fountain pen.In 1903, Mark Twain, the legendary American author, expressed the virtues of this unique self-filling fountain pen by saying, I prefer it to ten other fountain pens, because it carries its filler in its own stomach and I can not mislay even by art or intention. Becoming the official spokesman for The Conklin Pen Company, Mark Twain discovered yet another benefit to Conklins Crescent Filler stating, Also, I prefer it because it is a profanity saver; it cannot roll off the desk.Dimensions: Close 5.57 inches – Posted 6.5 inches – Weight 27 gmsTrim: Black/Rose Gold Trim or Green/Gold TrimNib Grades: Fine, Medium, StubFilling Mechanism: Crescent FillWriting Mode: Fountain PenEdition: Regular EditionWarranty: Lifetime