Our normal five day return privilege applies. Regarding what we classify as “modern” pens (ca 1980+), should the pen stop functioning properly at a later time, we sometimes cannot restore the pen due to lack of parts or inaccessability of the mechanism. Because of this, our normal one year warrantee does not apply. If we cannot fix the pen, you may have recourse through the manufacturer or distributor. Thank you for understanding. See “Warrantees” for more complete information.