All of a notary public’s certifications must either be under an official seal or carry the legible imprint of an official rubber stamp. An official seal must have the following information printed on it: the notary’s name; and the words “Notary Public” and “New Hampshire”. If the notary uses an
embosser, he or she must also have a separate rubber stamp that has the expiration date of the notary public’s commission on it.
Source: (RSA 455:3)