The treasurer is authorized to issue registered bonds of $100 each, and multiples thereof, in exchange for coupon or other registered bonds of the state, respectively bearing the same rate of interest as the bonds received in exchange, and payable at the same time. If the payee of a registered bond duly assigns it to another party, it shall be the duty of the treasurer or a designated agent engaged under N.H. Rev. Stat. § 6:8-b to issue to the assignee thereof a new bond as aforesaid, upon request and surrender of the old bond thus assigned. The bonds so issued shall be signed by the treasurer, countersigned by the governor, and attested, under the seal of the state, by the secretary, subject to the provisions of RSA 93-A; provided, that if a transfer agent or similar agent is engaged under N.H. Rev. Stat. § 6:8-b, the bonds may be executed with the facsimile signatures of the treasurer, the governor and the secretary and the manual signature of a duly authorized officer of said agent. The treasurer or designated agent shall keep a record of the new bonds, showing the serial number, date, and amount of each, and to whom and when payable.