China 1942 16c olive-brown error, SG688m varChina 1942 (1 Nov) 16c olive brown Domestic Postage Paid Yunnan surcharge, horizontal pair, imperforate between, SG688m var. A surprisingly fine quality example, particularly well centred, fresh and unused. A few shortish perforations, which do not detract from the overall fine quality of the piece. A rare surcharged stamp which was on sale at $1. 16 for a few days only and very rare with the imperforate error as a pair. Chan Catalogue No: 636a. BUY