California Code, Penal Code - PEN § 23670

(a)(1) A violation of Section 23660 or 23665 is punishable by a civil fine of up to five hundred dollars ($500).

(2) A second violation of any of those sections, which occurs within five years of the date of a previous offense, is punishable by a civil fine of up to one thousand dollars ($1,000) and, if the violation is committed by a licensed firearms dealer, the dealer shall be ineligible to sell firearms in this state for 30 days.

(3) A third or subsequent violation that occurs within five years of two or more previous offenses is punishable by a civil fine of up to five thousand dollars ($5,000) and, if the violation is committed by a licensed firearms dealer, the firearms dealer shall be permanently ineligible to sell firearms in this state.