Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1109:
1933 (May 29), Italy Flight mixed franking registered cover from Tripoli to Rome, franked by 3 Tripolitania air post values, including Zeppelin 5L purple, and two Libyan Sibyl stamps of 20c green (one – on reverse), violet confirmation cachet and Rome machine arrival is on reverse, VF and scarce franking, Sieger #213B var, Est. $300-$400, Scott #C10-11, C22
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