Spanish civil war collection
Reproducing a flag of the Partido Obrero de Unificación Marxista (POUM) in English the Workers' Party of Marxist Unification.
This was a flag displayed in a POUM column that included George Orwell, author of Homage to Catalonia.
Flag reads 'Caserna Lenin - POUM'.
Which translates as 'Lenin Barracks'.