U.S. Airmail Cover Accumulation, 1918-29. Approximately 90 covers; mostly first flights with the majority of cover franked with 1st and 2nd issue airmails, majority of first flights from 1926 with some duplication on several flights, few Zeppelin flights, Lindbergh, #C1 blocks including centerlines; worth inspection. Estimate  $1,000 - 1,500. $0