This excerpt taken from the AMZN 8-K filed Sep 18, 2007.
6.2 Certificates for Shares
The shares of the corporation shall be represented by certificates, provided that the Board may provide by resolution that some or all of any classes or series of the corporations stock shall be uncertificated shares. Each holder of stock represented by certificates shall be
entitled to a certificate signed by, or in the name of the corporation by the Chairman of the Board, President, or a Vice President, and by the Treasurer or an Assistant Treasurer or the Secretary or an Assistant Secretary, any of whose signatures may be a facsimile. The Board may in its discretion appoint responsible banks, trust companies or other professionals from time to time to act as transfer agents and registrars of the stock of the corporation; and, when such appointments shall have been made, no stock certificate shall be valid until countersigned by one of such transfer agents and registered by one of such registrars. In case any officer, transfer agent or registrar who has signed or whose facsimile signature has been placed upon a certificate shall have ceased to be such officer, transfer agent or registrar before such certificate is issued, it may be issued by the corporation with the same effect as if such person was such officer, transfer agent or registrar at the date of issue. All certificates shall include on their face written notice of any restrictions that may be imposed on the transferability of such shares and shall be consecutively numbered or otherwise identified.