Wyo. Stat. § 41-10-135
Any such general obligation bonds, revenue bonds or special assessment bonds shall be executed in the name of and on behalf of the district and signed by the chairman of the board with the seal of the district affixed thereto and attested by the secretary of the board. Except for such bonds which are registerable for payment of interest, interest coupons payable to bearer shall be attached to the bonds and shall bear the original or facsimile signature of the chairman of the board. The bonds and coupons, bearing the signatures of the officers in office at the time of the signing thereof, shall be the valid and binding obligations of the district, notwithstanding that before the delivery thereof and payment therefor, any or all of the persons whose signatures appear thereon shall have ceased to fill their respective offices.
W.S. 41-10-135