38 U.S.C. § 7266: Notice of appeal

(a) In order to obtain review by the Court of Appeals for Veterans Claims of a final decision of the Board of Veterans’ Appeals, a person adversely affected by such decision shall file a notice of appeal with the Court within 120 days after the date on which notice of the decision is issued pursuant to section 7104(e) of this title. (b) An appellant shall file a notice of appeal under this section by delivering or mailing the notice to the Court. (c) A notice of appeal shall be deemed to be received by the Court as follows:(1) On the date of receipt by the Court, if the notice is delivered. (2) On the date of the United States Postal Service postmark stamped on the cover in which the notice is posted, if the notice is properly addressed to the Court and is mailed. (d) For a notice of appeal mailed to the Court to be deemed to be received under subsection (c)(2) on a particular date, the United States Postal Service postmark on the cover in which the notice is posted must be legible. The Court shall determine the legibility of any such postmark and the Court’s determination as to legibility shall be final and not subject to review by any other Court.