Rule 4520. Certificate or affidavit of public officer. Where a public officer is required or authorized, by special provision of law, to make a certificate or an affidavit to a fact ascertained, or an act performed, by him in the course of his official duty, and to file or deposit it in a public office of the state, the certificate or affidavit so filed or deposited is prima facie evidence of the facts stated.
