1880 50p brown violet, gummed on both sides as often, well centered, irregular perforations at top, fine, with Adolph Ernst certificate, cat. $275 (Cat No. 31a) (Image)

Cat. $275, Est.$150

1880 50p brown violet, gummed on both sides as often, irregular perforations at right, fine, signed Dr.Hirsch, with his 1965 certificate, cat. $275 (Cat No. 31a) (Image)

Cat. $275, Est.$150

1916 overprinted "Serbien" in red, complete set of 21, l.h. or h.r., fine-v.f. (ANK Euro 800) (Cat No. 1N1-21P) (Image)

Est.$250

1916 1h-10kr diagonal overprints, complete set in blocks of four, used on individual "Feldpost" covers, each with "Kaiserlich Deutsche Sudarmee" military handstamp, fine-v.f., most unusual set (Cat No. 1N1-21) (Image)

Est.$750