U

  Section 3-308 states: Burden of establishing signatures, defenses and due course. -- (1) Unless specifically denied in the pleadings each signature on an instrument is admitted. When the effectiveness of a signature is put in issue (a) the burden of establishing it is on the party claiming under the signature; but (b) the signature is presumed to be genuine or authorized except where the action is to enforce the obligation of a purported signer who has died or become incompetent before proof is required. (2) When signatures are admitted or established, production of the instrument entitles a holder to recover on it ...