Actually, these are for China itself, Scott# 865, first issued in 1948. Your identifying key for the country is the sun symbol, appearing on Chinese stamps in the 1930s and 1940s. However, overprints on those may indicate a regional issue.
These were overprinted/surcharged into the new currency at the time, gold yuan. The two characters at right state that. The left characters read 2 yuan, restated at the bottom in arabic numerals.