1930 (25 May) Iran Teheran - Moscow - Berlin - Vienna - Belgrad - Athen, Airmail
Registered cover, flights Teheran - Baku, Baku - Moscow, Moscow - Berlin, Berlin - Vienna, Vienna - Belgrad, Belgrad - Saloniki (Muller 20 (Iran), 26 and 16 (USSR), 363 (Germany), 161 (Austria), 19 (Yugoslavia) CV $6,300)

From ex Dr. Peter Moeller collection that received the Large Gold Medal at the Hannover 2011 Exhibition.

Tehran - Baku:
Junkers Air Transport Persia,
Baku - Moscow:
UKRVOZDUKHPUT,
Moscow - Berlin:
DERULUFT,
Berlin - Vienna:
DLH/OELAG,
Vienna - Belgrade:
OELAG/LA.,
Belgrade - Thessaloniki:
AEROPUT

Postmark:
Tehran 25.5.1930
Tehran Lp confirmation
Moscow 29.5.1930
Berlin 30.5.1930
Berlin MLb
Vienna 30.5.1930
Belgrade 31.5.1930
Salonika 31.5.1930
Athens 2.6.1930

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Teheran — Baku:
Junkers Luftverkehr Persien,
Baku — Moskau:
UKRVOZDUKHPUT,
Moskau - Berlin:
DERULUFT,
Berlin — Wien:
DLH/OELAG,
Wien — Belgrad:
OELAG/LA.,
Belgrad - Saloniki:
AEROPUT

Poststempel:
Teheran 25.5.1930
Teheran Lp-Bestätigung
Moskau 29.5.1930
Berlin 30.5.1930
Berlin MLb
Wien 30.5.1930
Belgrad 31.5.1930
Saloniki 31.5.1930
Athen 2.6.1930