Section 4
SEC. 4. It shall be the duty of the Treasurer of the Philippines, the treasurer of any province, chartered city, or municipality, and the cashier and tellers of any bank doing business in the Philippines, upon presentation by any person of treasury certificates that have not been marked with the official seal of the Republic of the Philippines, to exchange such treasury certificates with those that have been previously marked that are in his possession at the time the presentation is made.