737 CSS1131 on a very scarce 1947 cover from Nanking to Shanghai on a special night train with the new 'Moving Train Post Office' car. Cover with these slips intact are very scarce.

737 CSS1131 on a very scarce 1947 cover from Nanking to Shanghai on a special night train with the new 'Moving Train Post Office' car. Cover with these slips intact are very scarce.