Section 312. Contents of certificate of authentication

1. An officer
  authenticating a certificate of acknowledgment or proof must subjoin  or
  attach to the original certificate a certificate under his hand.
    2. When the certificate of acknowledgment or proof is made by a notary
  public,  without  the  state  but within the United States or within any
  territory, possession, or dependency of the United States, or within any
  place over which the United States, at the time when such acknowledgment
  or proof is taken, has or exercises jurisdiction, sovereignty,  control,
  or  a  protectorate,  the  certificate  of  authentication must state in
  substance that, at the time when such original certificate  purports  to
  have  been  made, the person whose name is subscribed to the certificate
  was such officer as he is therein represented to be.
    In every other case the certificate of authentication  must  state  in
  substance  (a) that, at the time when such original certificate purports
  to have been made, the person whose name is subscribed to  the  original
  certificate  was  such  officer  as he is therein represented to be; (b)
  that the authenticating officer is acquainted with  the  handwriting  of
  the  officer  making  the  original  certificate,  or  has  compared the
  signature of such officer upon the original certificate with a  specimen
  of his signature filed or deposited in the office of such authenticating
  officer, or recorded, filed, or deposited, pursuant to law, in any other
  place,  and  believes  the  signature  upon  the original certificate is
  genuine; and (c), if the original certificate is required  to  be  under
  seal, that the authenticating officer has compared the impression of the
  seal  affixed  thereto  with  a  specimen  impression  thereof  filed or
  deposited in his office, or recorded, filed, or deposited,  pursuant  to
  law,  in  any  other place, and believes the impression of the seal upon
  the original certificate is genuine.
    3. When such original certificate is made pursuant to subdivision five
  of section two hundred ninety-nine of this chapter, such certificate  of
  authentication  must  also  specify that the person making such original
  certificate, at the time  when  it  purports  to  have  been  made,  was
  authorized,  by  the laws of the state, District of Columbia, territory,
  possession, dependency, or other place where the acknowledgment or proof
  was made, to take the acknowledgment or proof of deeds  to  be  recorded
  therein.
    4.  When  such  original  certificate  is made pursuant to subdivision
  seven of section three hundred one of this chapter, such certificate  of
  authentication  must  also  specify that the person making such original
  certificate, at the time  when  it  purports  to  have  been  made,  was
  authorized, by the laws of the country where the acknowledgment or proof
  was  made,  to  take acknowledgments of conveyances of real estate or to
  administer oaths in proof of the execution thereof.