§ 308. When certificate must be under seal. 1. When a certificate of
acknowledgment or proof is made without this state, whether within or
without the United States, (a) if made by a judge or other presiding
officer of a court having a seal, or by the clerk or other certifying
officer thereof, such certificate must be under the seal of such court;
(b) if made by a commissioner of deeds appointed pursuant to the laws of
this state to take acknowledgments or proofs without this state, such
certificate must be under his seal of office; (c) if made by any officer
specified in subdivision one of section three hundred one of this
chapter, such certificate must be under the seal of the legation or
consulate to which such officer is attached.

2. Any certificate, required by the provisions of section three
hundred eleven of this chapter to be authenticated, must be so
authenticated, in addition to being under seal as provided in this
section.