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Section 643 Of Article 3. Presumptions Affecting The Burden Of Producing Evidence From California Evidence Code >> Division 5. >> Chapter 3. >> Article 3.

643
. A deed or will or other writing purporting to create, terminate, or affect an interest in real or personal property is presumed to be authentic if it:
  (a) Is at least 30 years old;
  (b) Is in such condition as to create no suspicion concerning its authenticity;
  (c) Was kept, or if found was found, in a place where such writing, if authentic, would be likely to be kept or found; and
  (d) Has been generally acted upon as authentic by persons having an interest in the matter.