"104" together with large K2 "DARMSTADT 1 DEC. 1861" on a postal district letter, 3 Kr. to Michelstadt (arrival postmark). The number stamp was placed again next to the stamp. Stamp with slight letter crease. Expertised by Horst Krause (HK), photo certificate Sommer BPP. The number stamps were only intended for canceling the stamps, therefore blank strikes are rare!