cover LETTER OF INSURANCE: 1939 (14 July) letter of insurance with red and dark blue threads bearing 1936-37 2f. and 6f. (3) cancelled by Harbin comb dater, the reverse with Japanese seal labels (5). Fresh and very fine, scarce

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cover LETTER OF INSURANCE: 1939 (14 July) letter of insurance with red and dark blue threads bearing 1936-37 2f. and 6f. (3) cancelled by Harbin comb dater, the reverse with Japanese seal labels (5). Fresh and very fine, scarce