Section Nineteen Hundred and Thirty-one. A public seal in this State is a stamp or impression made by a public officer with an instrument provided by law, to attest the execution of an official or public document, upon the paper, or upon any substance attached to the paper, which is capable of receiving a visible impression. A private seal may be made in the same manner by any instrument, or it may be made by the scroll of a pen, or by writing the word “seal” against the signature of the writer. A scroll or other sign, made in a sister State or foreign country, and there recognized as a seal, must be so regarded in this State.
Source:
Section [1931.], https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=[1931.]..