1931 (22 June) A cover to USA, bearing overprinted 'For use in Ki-Hei' on Junk 5c and Reaper 15c, tied by illegible cancel, with 'Return To Writer…' USA Frame chop in violet on front, with bilingual 'STANDFORD/20.8.31' arrival cds, since the fall of Northeast during the Sino-Japanese war, it could only go to Shanghai, hence with bilingual 'SHANGHAI/1.32' arrival cds. Photo (Imagea)

Est. HK$600-800

1946 SYS 1st Peiping Central Print, engraved typographed proof, no value indication, light purple, printed on buff paper, size: 72.18 x 88.50mm, very fine and rare. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value 5c lake, printed on buff paper, size: 69.69 x 89.40mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value 10c orange, printed on buff paper, size: 69.90 x 89.50mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value 15c light purple, printed on buff paper, size: 69.30 x 90.0mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value 20c apple green, printed on buff paper, size: 69.30 x 88.90mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value 25c blackish grey, printed on buff paper, size: 69.20 x 90.70mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $1 blue, printed on buff paper, size: 69.90 x 89.40mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $1.50 greyish purple, printed on buff paper, size: 69.0 x 88.50mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $2 deep purple, printed on buff paper, size: 69.85 x 89.3mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $2.50 blue black printed on buff paper, size: 70.20 x 89.0mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $3 brown printed on buff paper, size: 69.2 x 88.0mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $4 light brown printed on buff paper, size: 69.60 x 89.60mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $4 orange brown, printed on buff paper, size: 70.30 x 89.40mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $5 grey green printed on buff paper, size: 68.50 x 89.05mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $8 light green, printed on buff paper, size: 68.60 x 89.30mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $10 orange brown, printed on buff paper, size: 69.95 x 89.15mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $10 rose red printed on buff paper, size: 69.70 x 89.25mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $18 greyish purple, printed on buff paper, size: 69.72 x 89.27mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $20 greyish green, printed on buff paper, size: 70.17 x 89.25mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1946 SYS 1st Peiping Central Print, engraved typographed proof, value $20 grey brown printed on buff paper, size: 68.40 x 89.0mm, never hinged, very fine and scarce. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $22 grey, printed on buff paper, size: 70.0 x 89.35mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $26 light brown, printed on buff paper, size: 70.0 x 88.5mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $44 brownish red, printed on buff paper, size: 70.0 x 89.4mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000

1947 SYS 2nd Peiping Central Print, engraved typographed proof, value $50 light grey, printed on buff paper, size: 70.20 x 89.4mm, never hinged, very fine and scare. Photo (Image1)

Est. HK$10,000-15,000