1926 CSS PCI[YN]-1 Yunnan Province International Postal Card, 4c on red. Overprinted in Chinese characters. "Restricted for mailing in Yunnan", 4c on red.

1926 CSS PCI[YN]-1 Yunnan Province International Postal Card, 4c on red. Overprinted in Chinese characters. "Restricted for mailing in Yunnan", 4c on red.