unused -- Overprinted Chung Hwa and Dah Tung Sun Yat-sen issues, a specialised mostly mint collection neatly mounted on leaves, including Regional Surcharge multiples with "Double Tso" and "Double Fun" varieties, bogus surcharges, imprint blocks, Kansu 3c. on 5c. surcharge types in multiples including 3c. on 5c. Chung Hwa tête-bêche pair, East Szechwan 3c. on 5c. double surcharge (2), etc. A fine lot