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| 邮戳真假尚未确定,飞行日期是正确的。 “齐柏林飞艇”在1930年5月18日腓特烈港开始泛美航。
 The 1930 Europe-Pan American flight originated in Friedrichshafen on
 18 May and stopped first in Seville before leaving Europe. The Graf
 arrived in Brazil first at Recife (Pernambuco) docking at Campo do
 Jiquiá on 22 May where it was greeted by a crowd of more than 15,000
 before preceding on to Rio de Janeiro. The airship then flew back
 north to Lakehurst, NJ, before heading east over the Atlantic on 2
 June to return to Germany with another stop in Seville.
 (https://en.wikipedia.org/wiki/LZ_127_Graf_Zeppelin)
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