Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 32:
ZEPPELIN FLIGHTS: 1925 (May 10-11), Airship (Z.R.3) Los Angeles two covers from Puerto Rico to US, franked by Washington 2c carmine, tied by Air Mail Service Mayagüez or by normal date stamp of San Juan, both dated ”May.6.1925”, the last one with additional three-line confirmation marking ”Via Air Mail. San Juan to New York, USS Los Angeles”, appropriate receivers on the back, F/VF, Sieger #20V, W, €500, Est. $250-$300
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