When other evidence of the execution of writing need not be produced.
Section 326
SEC. 326. When other evidence of the execution of writing need not be produced. — Where a writing is more than thirty years old, and evidence is given that the party against whom the writing is offered has at any time admitted its execution, or where the writing is one produced from the custody of the adverse party, and has been acted upon by him as genuine, no other evidence of the execution need be given.