The first fountain pen was introduced in 1933<ref>this date is cited [http://www.billspens.com/BillsPens/esterbrook/esterbrook.htm here].</ref> corresponding to the first patent for interchangeable nibs. In 1935 the company introduced the [[Dollar Pen]] model, called so for its price, just a dollar. | The first fountain pen was introduced in 1933<ref>this date is cited [http://www.billspens.com/BillsPens/esterbrook/esterbrook.htm here].</ref> corresponding to the first patent for interchangeable nibs. In 1935 the company introduced the [[Dollar Pen]] model, called so for its price, just a dollar. |