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CAM-27W3%u2014%u2014August 1, 1928%u2014%u2014South Bend to Sacramento, CA.%u2014%u2014Thompson Aeronautical Corp. This was the first flight of this route after the Air Mail postal rate was reduced from 10%u00a2 to 5%u00a2.Addressee, Harry E. Klotzbach, was a pioneer in producing cachets for First Day Covers, owner of the Acorn Stamp Co., and the International Secretary of the Southern Philatelic Association.