Hello to all members
I´m pretty sure that the "X" is not a Spanish mark (postal or censorship).
The Spanish censorship mark on the back reads "CENSURA GUBERNATIVA DE COMUNICACIONES / GRUPO C / VALENCIA DE CID", meaning (more or less) "Government censorship of (postal) communications / Group C / Valencia del Cid". Valencia del Cid is nowadays the city of Valencia.
As you know, the French censor was in Carcassonne (PB code) and the number is one of three assigned to that station.
Controle postal France.jpg
Regards.
José M.
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