royally Danish postal administration in Schleswig Holstein Denmark 8 S dark yellow green royally insignia background wave-like issue 1858 private perforated L 12 1 / 2 on folded letter to Oldenburg cancellations: three ring postmark (unidentifiable, probably "2") and ZKr K. D. O. P. A. Hamburg 12 10 8-9 A, present it concerns an probable about a unique, by Michel not noted down franking, the letter was the BPP association expert Moeller presented, this has however, for want of of the suitable comparison material, a certifying not undertaken, the letter becomes therefore as "as is" offered