Postal History of the Spanish Civil War
Republican Postal History of the Spanish Civil War
Nationalist Postal History of the Spanish Civil War
Only the dates of the postmarks have been taken in consideration for this classification, but not the text of the content if any. Postmarks with unreadable dates or covers with no postmarks are under the category "Undated".
Antequera postmark dated on January 5, 1937 and double censor: Antequera censor label Heller A104.1 on the back and Algeciras mark Heller A64.1 on the front. Gibraltar arrival backstamp. The consul of Mexico in Gibraltar offered an interlines postal service, communicating people from both zones, Republican and Nationalist.