1 / 2 Groschen postal stationery postcard with rare cancellation through blue two ring cancel "MARTEN 25 8 73 11-12", mailed to Dortmund, photo expertize Hansmichael Krug BPP "the in blue colour rare postmarks is twice clear mounted. the card to Dortmund is after the from 1.7.1872 applicable collective with 1 / 2 Groschen correct franked. in perfect excellent preservation. "