New York General Construction Law Section 45 - Seal, private as corporate seal.

  45.  Seal, private as corporate seal. An instrument or writing duly
  executed, in the corporate name of a corporation, which shall  not  have
  adopted  a  corporate  seal,  by  the proper officers of the corporation
  under their private seals, shall be deemed to have been  executed  under
  the corporate seal.

Last modified: February 3, 2019