STAMPS: Block of Six Scott C5 16¢ Air Mail Stamps

Rare Choice Block of Six Scott C5 16¢ “Air Mail” Stamps. Scott C5. 16¢. “Air Mail” Block of 6. Choice Very Fine to Extremely Fine, Mint Never Hinged. . Issued August 17, 1923 for use in the new night-flying air mail service between New York and San Francisco. Three zones were established and the rate was 8 cents an ounce for each zone. Service was inaugurated July 1, 1924. Stamps depict the Air Service Emblem. Printed in dark blue. A beautiful, fresh bold uncut block, having impressive eye appeal..