1901 Flying Mercury 2L trial colour proof in yellow-brown on thick yellowish paper in imperforate block of four, fine (Image)

1901 Flying Mercury 2L trial colour proof in blue-green on thin card in imperforate block of four, fine (Image)

1901 Flying Mercury 2L trial colour proof in black (issued colour) on thin watermarked paper in imperforate block of four, fine (Image)

1901 Flying Mercury 3L trial colour proof in reddish-brown on yellowish paper in right marginal imperforate block of four, with dried gum, fine (Image)

1901 Flying Mercury 3L trial colour proof in reddish-orange (oxidised) on yellowish paper in imperforate block of four, fine (Image)

1901 Flying Mercury 3L trial colour proof in blue on thin watermarked paper in imperforate block of four, fine (Image)

1901 Flying Mercury 5L trial colour proof in green (issued colour) on thin unwatermarked paper in top marginal imperforate block of four, light horizontal bend through top stamps otherwise fine (Image)

1901 Flying Mercury 10L trial colour proof in rose-carmine (issued colour) on thin watermarked paper in imperforate lower left marginal block of four, fine (Image)

1901 Flying Mercury 20L trial colour proof in bistre-yellow on watermarked paper in imperforate upper left marginal block of four, fine (Image)

1901 Flying Mercury 20L trial colour proof in brownish-grey on gummed watermarked paper in imperforate block of four, fine (Image)

1901 Flying Mercury 50L trial colour proof in black on watermarked paper in imperforate upper marginal block of four, fine (Image)

1901 Flying Mercury 50L final die proof in brownish-red (issued colour) in sheetlet format, 64x70mm, very fine (Image)

1901 Flying Mercury 1D final die proof in black (issued colour) on thin paper in sheetlet format, 46x48mm, very fine, signed on reverse (Image)

1901 Flying Mercury 1D final die proof in black (issued colour) on gummed paper in imperforate pair, fine (Image)

1901 New Year’s greeting card from the Greek postal authority, with the designs of the 1901 5L, 10L, 25L, 50L & 5D, 1902 1D and 1902 3L postage due, with embossed logo at top left, greetings message in French, very fine (Image)

1902 Metal Value die proof with blank value tablets in black on thick card, 48x56mm, very fine (Image)

1902 Metal Value 5L to 2D set of plate proofs in black on yellowish watermarked paper, all top marginal blocks of four, very fine (Image)

1902 Metal Value 1D die proof with black on thick card, 48x56mm, very fine (Image)

1911 “Engraved” issue 1L trial colour proof in rose-red, two imperforate blocks of four (block of eight reconstruction) on stiff paper, signed on reverse with sheet positions annotated, very fine (Image)

1911 “Engraved” issue 1L trial colour proof in olive-green, imperforate block of four on stiff paper, annotated on reverse with sheet positions, very fine (Image)

1911 “Engraved” issue 2L trial colour proof in blue, imperforate block of eight (reconstructed from two blocks of four) on stiff paper, signed on reverse with sheet positions annotated, very fine (Image)

1911 “Engraved” issue 3L trial colour proof in black, imperforate block of eight (reconstructed from two blocks of four) on stiff paper, signed on reverse with sheet positions annotated, very fine (Image)

1911 “Engraved” issue 3L trial colour proof in brown, imperforate block of four on stiff paper, annotated on reverse with sheet positions, very fine (Image)

1911 “Engraved” issue 5L trial colour proof in rose-red, two imperforate blocks of four (block of eight reconstruction) on stiff paper, signed on reverse with sheet positions annotated, very fine (Image)

1911 “Engraved” issue 10L trial colour proof in black, imperforate block of eight (reconstructed from two blocks of four) on stiff paper, signed on reverse with sheet positions annotated, very fine (Image)