1930 Graf Zeppelin, 40k dark blue, 80k carmine, imperforate horizontal pairs, l.h., natural gum inclusions, fresh and v.f., various handstamped guarantee marks, signed Mikulski, (Cat No. C12b-13b) (Image)

Est.US$4,000

1931 50k gray blue (error), h.r., v.f., (Cat No. C23a) (Image)

Est.US$250

1931 North Pole, 35k gray blue, imperforate trial color proof affixed on gray presentation card by red PROEKT 25 June 1931 overprint, v.f., with Zagorsky certificate, rare (Cat No. C27P) (Image)

Est.US$7,000

1935 Moscow-San Francisco 1r on 10k dark brown (Levanevsky), lower case Cyrillic "f", n.h., v.f., signed Goznak, with 2015 Hovest certificate, (Cat No. C68b) (Image)

Est.US$1,000

1922 1,200m on 10k, h.r., v.f., signed Richter, Stolow, etc., (Cat No. CO5) (Image)

Est.US$500