CHINA. 1947 cover sent with sender's (Cheng-Chung Book Co) advert on reverse, used locally in Shanghai, with "Postage Paid Shanghai 1947 Apr 10" roller cancel showing promotions of 'postal savings' and 'stamp booklets' in the boxes, with next day arrival c.d.s. Minor transit tears at bottom. Scarce cover, as the surviving rate for these advertising bulk mail usages is low. (Photo). Est. 150 - 200 CHF.