Cal. Health & Saf. Code § 4622
The bonds shall be issued in any denominations which the governing body may determine.
The bonds shall be signed by the mayor, or by such other officer of the city as shall be designated for that purpose by the governing body by resolution, and shall also be signed by the city treasurer and countersigned by the city clerk or a deputy clerk.
The coupons of the bonds shall be numbered consecutively and signed by the treasurer.
All signatures and countersignatures on the bonds and coupons, except that of the clerk or his deputy, may be printed, lithographed, or engraved.
If any officer whose signature or countersignature appears on the bonds or coupons ceases to be an officer before the delivery of the bonds to the purchaser, his signature or countersignature is as valid and sufficient for all purposes, as if he had remained in office.
Ca. Health and Saf. Code § 4622