Except as provided in section 14-3971, to be effective to prove the transfer of any property or to nominate an executor, a will must be declared to be valid by a statement of informal probate by the registrar, or an adjudication of probate by the court, except that a duly executed and unrevoked will which has not been probated may be admitted as evidence of a devise if both:
A.R.S. § 14-3102