Air mail cover from France (Nimes) to Barcelona with censor mark Heller RB3.12a green

An outstanding international air mail cover sent from Nîmes, France, to Barcelona during the Spanish Civil War. This item is an important document of foreign postal connections entering the Republican zone, featuring a scarce and well-documented military censor handstamp.

• Item Type: Postal History / Air Mail / Incoming Censored Mail.

• Origin: Nîmes (France).

• Destination: Barcelona.

• Year: 1937.

• Censor Marking: Heller No. RB31.2a (Green ink).

Historical and Philatelic Context: During the Spanish Civil War, incoming international correspondence addressed to the Republican territory was subjected to strict military censorship to prevent espionage and control information. This cover, transported via air mail routes from France, passed through the Barcelona exchange office, where it was intercepted and reviewed. The civilian censors applied the characteristic rectangular handstamp of the Barcelona censorship board, noted in specialized reference literature by Heller as catalog number RB31.2a. Finding this specific marking struck in green ink is scarce, making it a highly desirable piece for collectors specializing in wartime censorship and international air mail routes.