Lot 1087 — China #307-310 Northwest Scientific Expedition of Sven Hedin set of four, sold for $230 July 24, 2020April 18, 2013 by Sparks Auctions Lot 1087 China #307-310 1932 Northwest Scientific Expedition of Sven Hedin Issue of 4 stamps (MH). Fresh colour on a presentation card. Scott CV$116, SOLD for $200 plus premium.