been changed from 'Culebra Cut' to 'Gaillard Cut' but by then the 24c stamp commemorating this had already been printed with the former title. Most of the 1917 issues were never sold and were destroyed. 1921 issues In 1921, the Republic of Panama planned to issue a Centennial commemorative series in honor of the 100th anniversary of Panama's independence from Spain. The Canal Zone was invited to participate in a postal way and the Canal Zone's Executive Secretary was pleased to accept their invitation. By the middle of January 1924, all the stamps of the 1¢ and 2¢ denominations were nearly exhaustedwhich prompted the next production of stamps, issued that year. 1924 Coat of Arms issue Panama had ordered the new permanent coat of arms set both for use in Panama and for the Canal Zone. When stocks of the 1¢ Vallarino stamp were nearly used up it became imperative to have a new supply of 1-cent stamps at once. The Canal Zone Postal Authority requisitioned 50,000 of the 1¢ stamp from Panama for overprinting at Mount Hope and Panama sent over the Vallarino 1¢ stamp. On January 28, 1924, these stamps were overprinted at Mount Hope. Panama was billed for the cost of this overprinting. Before Panama was sent its order for its coat of arms series from the American Bank Note Company, it sent a letter of inquiry to the Canal Zone Administration informing them of their pending order and requested estimates of Canal Zone's stamp requirements for the next year. The Canal Zone overprints were shipped from the United States in January and February 1924 and delivered to the Canal Zone. The Coat of Arms stamps were printed in denominations ranging from 1-cent to 50-cents, however, only the 1-cent and 2-cent issues were ever released for use as postage. 1924–1925 overprints U.S. Regular Issues printed on the flat plate press in 1922 were overprinted with the words CANAL ZONE and converted to Canal Zone Postage. The Bureau of Engraving and Printing received the first order of stamps from the Canal authorities in 1924. 1928 permanent issues On October 1, 1928, the first permanent issue Canal Zone stamp, 2 cent Goethals, was placed on sale. Other permanent issues followed, designed to honor new members of the Isthmian Canal Commission established on the Isthmus during 1907: Lieut. Col. George W. Goethals, Chairman and Chief Engineer; The denominations of the