78
        
        
          493
        
        
          493
        
        
          1928 (21 apr.) An opened postage due cover from Mongolia to Harbin , on reverse bearing Mongolia 25m light green, tied by
        
        
          'MONGOLIA' cds, bilinugal 'HARBIN' transit, on front with ROC postage due 20c blue, tied by bilingual 'SHANGHAI' and 'T/20'
        
        
          postage due frame chop in black. Plus another postage due cover from Mongolia, bearing 50m orange, tied by 'ULANBATOR' cds,
        
        
          and 'T/40' postage due frame chop in black, with 'R/N 832/ULANBATOR' reg. frame chop in black, small part of address is cut off
        
        
          from cover. Photo
        
        
          HK$ 5,000 - 6,000
        
        
          
            Republic of China
          
        
        
          494
        
        
          495
        
        
          496
        
        
          497
        
        
          494
        
        
          1912 Opt. 'Provisional Neutrality' and 'Republic of China, Provisional Neutrality' both on Coiling Dragon 3c blue green, used. Chan
        
        
          140, 145. Photo
        
        
          HK$ 800 - 1,000
        
        
          495
        
        
          1912 Opt. 'Provisional Neutrality' on Flying Geese $1 red and pale rose, with character 'One' retouched, mint, toned and dirty on
        
        
          surface with security chop on back, a rare item. Chan 141a. Photo
        
        
          HK$ 35,000 - 40,000
        
        
          496
        
        
          1912 Opt. 'Republic of China, Provisional Neutrality' on Flying Goose $1 red and pale rose, with character 'One' retouched, mint
        
        
          original gum lightly hinged with security chop on back, a rare item. Chan 149a. Photo
        
        
          HK$ 50,000 - 60,000
        
        
          497
        
        
          1912 Opt. 'Republic of China, Provisional Neutrality' on Flying Goose $5 green and salmon with bottom sheet margin, full original
        
        
          gum lightly hinged, extremely fine. With RPS 1952 cert. Chan 151. Photo
        
        
          HK$ 80,000 - 90,000