1897, black large surcharge 2c on Red Revenue stamp of 3c, tiny thin spot at bottom left, part of OG, F/VF, C.v. $500, Est. $150-$200 (Image)

1897, black large surcharge 4c on Red Revenue stamp of 3c, nice single with intact perforation, large part of OG, fine centering, C.v. $1,650, Est. $700-$800 (Image)

1897, black large surcharge $1 on Red Revenue stamp of 3c, perfect quality item, full OG, LH, and rare, neat expert's sign on reverse, C.v. $5,000, Est. $3,500-$4,000 (Image)

1912, Waterlow & Sons vertical carmine overprint ''Republic of China'' on 1c ocher, right margin block of four with horizontal gutter in the middle, imperforated between top stamps and gutter, fresh, unused, no gum, VF, Chan #170d var, Est. $150-$200 (Image)

1912, Waterlow & Sons vertical carmine overprint ''Republic of China'' on 2c green, block of four with horizontal gutter in the middle and gutter strip at left, imperforated between bottom stamps and gutter, full OG, hinged, VF, Chan #171 var, Est.$250-$300 (Image)

1938, Dr. Sun Yat-sen, $1 red brown and sepia, $2 blue and red brown and $5 scarlet and deep green, type I in complete set of three, plate No. blocks of four, post office fresh, full OG, NH, VF, C.v. $1,010++, SG #457/59, £1,500 as hinged singles, Chan #366-68, Est. $700-$800 (Image)

1939, Dr. Sun Yat-sen, 16c olive gray, perforation 12½, type III, vertical pair imperforated between stamps, full OG, LH, VF, Chan #379a, ex-Huang Ming Fung, C.v. $250, Est. $150-$200 (Image)

1939, Dr. Sun Yat-sen, $5 scarlet and deep green, perforation 12½, type III, vertical pair imperforated between stamps, fresh, unused, no gum, VF, Chan #383d, C.v. $250, Est. $150-$200 (Image)

1942, Dr. Sun Yat-sen, $50 blue, block of four imperforated horizontally and rouletted (6½) vertically, no gum as issued, VF, Chan #617b, SG #661a, £480 as singles, Est. $250-$300 (Image)

1945, Dr. Sun Yat-sen, $10 red brown, rough perforation 12½, right sheet margin vertical pair imperforated horizontally, no gum as issued, NH, VF, Chan #621f, Est. $100-$150 (Image)

1946, Dr. Sun Yat-sen, $20 blue green, rough perforation 12½, top right corner sheet margin plate No. vertical strip of three imperforated at top and between stamps, no gum as issued, NH, VF, Chan #622e, Est. $150-$200 (Image)

1946, 50th Anniversary of Chinese Postal Service, large die proof of $100 in dark brown, printed on thin card, size 40x32mm, perfect quality, no gum as produced, VF and rare, Est. $400-$500 (Image)

1949, Dr. Sun Yat-sen, $20 brown purple, Gold Yuan issue, perforation 12½, small ''T'' at left of tie, right sheet margin imprint block of four, imperforated at right between stamp and margin, no gum as issued, NH, VF, Chan #G138g, Est. $150-$200 (Image)

Second Air Post issue. 1931 (April 14), First Flight Beijing - Nanking registered cover, franked by eight stamps, including the second air post set of 10c-90c, Nanking arrival and all appropriate markings are alongside, minor conveyance flaws, still F/VF and scarce franking, Est. $300-$400 (Image)