California Code, Penal Code - PEN § 25910

(a) Except as provided in subdivision (b), no endorsement or renewal endorsement issued pursuant to Section 25915 shall be effective unless it is in the format set forth in subdivision (c) of Section 25460.

(b) Any peace officer listed in subdivision (f) of Section 830.2 or in subdivision (c) of Section 830.5, who is retired between January 2, 1981, and on or before December 31, 1988, and who is authorized to carry a loaded firearm pursuant to this article, shall not be required to have an endorsement in the format set forth in subdivision (c) of Section 25460 until the time of the issuance, on or after January 1, 1989, of a renewal endorsement pursuant to Section 25915.