ChinaCovers and CancellationsAirmailInstructional Markings1940 (23 Dec.) envelope to Switzerland "<I>By Airmail via Shanghai thence via Siberia" bearing 81c. franking tied by Canton c.d.s. with grey-blue Par Avion etiquette and a fine strike of unboxed <I>Airmail up to Shanghai and, on the reverse, Canton and Tientsin (28.12) roller postmark. Attractive. Photo