Where the country of origin or the country whence the beneficiary comes does not issue such documentary proof of good repute or documentary proof of no previous bankruptcy, such proof may be replaced by a declaration on oath - or, in states where there is no provision for declaration on oath, by a solemn declaration - made by the person concerned before a competent judicial or administrative authority, or where appropriate a notary, in the country of origin or in the country whence that person comes; such authority or notary will issue a certificate attesting the authenticity of the declaration on oath or solemn declaration.