Because of the legal requirement that the seal be photographically reproducible, the rubber stamp seal has become all but universal; however, notaries may also use an embosser seal in addition to the rubber stamp. The legal requirements for a seal are shown below. (Government Code section 8207)
It is photographically reproducible when it is affixed to a document.
It contains the State Seal and the words "Notary Public."
It contains the name of the notary public as shown on the commission.
It contains the name of the county where the oath of office and notary public bond are on file.
It contains the expiration date of the notary public commission.
It contains the sequential identification number assigned to the notary public as well as the identification number assigned to the manufacturer or vendor for every seal or stamp manufactured on or after January 1, 1992.
It may be circular not over two inches in diameter, or may be a rectangular form of not more than one inch in width by two and one-half inches in length, with a serrated or milled edged border.