1/4 s. purple pink/gray-green, II.Auflage 1873 (50,000 pieces, of this the half only 80 days before the end of the course validity to Heligoland sent), very rare HORIZIONTAL PAIR with "HELIGOLAND mounting just and centrically over oblong stamp type II passing over two stamps". Both stamps with margin additions and this one con below one caught on locked, nevertheless of an attractive effect. Canceled pairs "seem" only extremely rare expertised Pfenninger, certificate C. Brettl BPP to the 1/4 shillings stamp.Michel, 7.000.-