California Code
ARTICLE 3 - Proof and Acknowledgment of Instruments
Section 1193.

1193. Officers taking and certifying acknowledgments or proof of instruments for record, must authenticate their certificates by affixing thereto their signatures, followed by the names of their offices; also, their seals of office, if by the laws of the State or country where the acknowledgment or proof is taken, or by authority of which they are acting, they are required to have official seals.

(Enacted 1872.)