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Document ID: 7398635
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Document Collection: 1-1-5-3-individuelle Unterlagen Buchenwald Männer
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Brg. X
Had the same question. Compare here: [Postkontrollkarten Männer Buchenwald] 6457325 - Außenlager?
First I thought, the last sign could be „SS“ in my card. Now that I have seen some more examples, I would say it´s „X“ (roman numerals).
Thanks for your help, @a.donner