Section 173.71 - Application for and issuance of certificate of number(a) The owner of a vessel to which § 173.11 of this part applies and for which a certificate of number is required may apply for that certificate to the issuing authority for the vessel's State of principal operation listed in Appendix A of this part. The application must be made in the manner specified by the issuing authority and must be accompanied by payment of any fee required by the issuing authority.(b) Upon determination that the owner's application for a certificate of number complies with the requirements of paragraph (a) of this section, the issuing authority may issue a certificate of number.(c) A duplicate certificate of number may be applied for and issued as provided by paragraphs (a) and (b) of this section upon the owner's statement that the original certificate is lost or destroyed.USCG-2003-14963, 77 FR 18700 , Mar. 28, 2012