Issued on May 1, 1942 for use in the Sinkiang (Xinjiang) province, this pristine mint never hinged block of nine features the 4 cent green stamp depicting Dr. Sun Yat-sen, overprinted for provincial use. Printed by Chung Hwa Book Co. in gravure on line perforated 12½ paper, this issue belongs to the Hong Kong print series adapted for remote regional postal needs. The design honors Sun Yat-sen as the founding father of the Republic, symbolizing political unity and regional autonomy during the wartime period. Catalogued as Scott SI120, Michel CN-IM-SI 108A, Yvert et Tellier CN-IM-SI 94A, Stanley Gibbons CN-IM-SI 144, and China Stamp Society CN-IM SK162, the block is in flawless mint never hinged condition with full original gum and bright, consistent color throughout. Estimate "$150 – 180"