Very interesting envelope sent from Bulgaria to the camp at Blechhammer.
It is interesting that the envelope has the complete address of the recipient but was sent from Bulgaria!
It seems that the Germans have a very well prepare and deliver to Bulgaria complet envelopes, probably for forced labor.
Envelope has a stamp of censorship
Do not encountered thing!
More info about this camp - https://en.wikipedia.org/wiki/Blechhammer