Rare letter with envelope sent by relative of a Czech inmate who was imprisoned in KL Mauthausen. It isn't that common to find letters sent from outside to a camp inmate! This is a good example, where envelope was preserved, indicating the Block and name of the inmate. Letter is fully written in German, which was obligatory. It passed the censorship of the camp since it has the rubber stamp. There's also another letter tranlate written in another paper and in Czech that came with this set. Condition is very good.