first-class mail

first-class mail Section 1. (a) The rate of postage on each single postal card issued and sold under the provisions of section 3916 of the Revised Statutes (U. S. C., title 39, sec. 356), and on each portion of double postal cards issued and sold under the provisions of the Act of March 3, 1879 (U. S. C., title 39, sec. 358), shall be 2 cents: Provided, That on all single and double postal cards sold in quantities of fifty or more there shall be an additional charge of 10 per centum. The rate of postage on each private mailing or post card conforming to the conditions prescribed by the Act of May 19, 1898 (U. S. C., title 39, sec. 281), shall be 2 cents. (b) Except as provided in paragraph (a) of this section, the rate of postage on mail matter of the first class when mailed for local delivery at post offices where free delivery by carrier is not established and when the matter is not collected or delivered by rural or star route carriers, shall be 2 cents for each ounce or fraction thereof.