California Code, Government Code - GOV § 55809

(a) The bonds, or each series thereof, shall be signed by the chairperson or vice chairperson of the governing board of the authority or the treasurer or auditor-controller of the authority, and the official seal, if any, of the authority shall be attached.

(b) The interest coupons, if any, of the bonds shall be signed by the treasurer or auditor-controller of the authority. All of the signatures and the seal may be printed, lithographed, photocopied, or mechanically reproduced. However, the bonds shall not be valid or become obligatory for any purpose until manually signed by an authenticating agent or trustee duly appointed by the authority or its authorized designee.

(c) If any officer whose signature appears on the bonds or coupons ceases to be that officer before the delivery of the bonds, the officer's signature is as effective as if the officer had remained in office.