1860 10k Poland Kingdom First Issue, Russian Empire (Postmark `1`, CV $300) (Image)

1909 15k In Favor of the Postman, Russian Empire (CV $450, MNH) (Image)

1909 15k In Favor of the Postman, Russian Empire (CV $250) (Image)

1913 1k Peter the Great, Romanov Tercentenary, Portrait only die proof in dark coral, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Frame only die proof in orange, printed on cardboard (!) paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Frame only die proof in raspberry rose, printed on cardboard (!) paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Complete die proof in slate blue, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Complete die proof in dark coral pink, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Complete die proof in purple grey, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Complete die proof in orange, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Bi-colour die proof in brown purple and slate grey, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Bi-colour die proof in olive and slate grey, printed on chalk surfaced thick paper (Image)

1913 1k Peter the Great, Romanov Tercentenary, Bi-colour die proof in red and slate grey, printed on chalk surfaced thick paper (Image)

1913 2k Alexander II, Romanov Tercentenary, Frame only die proof in dirty purple, printed on chalk surfaced thick paper (Image)

1913 2k Alexander II, Romanov Tercentenary, Complete die proof in dark mauve, printed on chalk surfaced thick paper (Image)

1913 2k Alexander II, Romanov Tercentenary, Complete die proof in orange red, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Frame only die proof in dusty purple, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Frame only die proof in slate green, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Frame only with filled center die proof in raspberry rose, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Frame only with filled center die proof in terracotta, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Complete die proof in dark mauve, printed on chalk surfaced thick paper (Image)

1913 3k Alexander III, Romanov Tercentenary, Complete die proof in slate green, printed on chalk surfaced thick paper (Image)

1913 4k Peter the Great, Romanov Tercentenary, Portrait only die proof in dark coral, printed on chalk surfaced thick paper (Image)

1913 4k Peter the Great, Romanov Tercentenary, Complete die proof in dark mauve, printed on chalk surfaced thick paper (Image)

1913 4k Peter the Great, Romanov Tercentenary, Complete die proof in orange, printed on chalk surfaced thick paper (Image)