Conn. Gen. Stat. § 52-179: Seal and its equivalent.

All instruments in writing executed by any person or corporation not having an official or corporate seal, purporting and intended to be a specialty or under seal, and not otherwise sealed than by the addition of the word “seal” or the letters “L.S.”, or, in the case of an official or corporate seal, by an impression of such seal upon the paper or other material employed, shall be deemed in all respects sealed instruments, and received in evidence as such.