Wyo. Stat. § 18-12-129: Signature on bonds.

Bonds shall be signed by the chairman and the treasurer of the board and countersigned by the secretary of the board. Coupons, if any, shall be signed by the treasurer of the board. At least one (1) of the signatures or counter signatures on the bond shall be manually affixed. Other signatures or counter signatures may be printed or mechanically reproduced. It is not necessary for any bond to bear the seal of the district.