Auction: 11005 - The Mizhuhara Collection of Mongolian Stamps                                                                            
                    
                    Lot: 1621
                
                    
                        Mongolia  Republic  1931 (9 May) red band cover to Kalgan  bearing, on the reverse, Ulan Bator Provisional 5c. purple, overprint in blue, with 1930 10m. on 1m. (2) tied by Ulan Bator c.d.s., Kalgan arrival (27.5) and China 10c. and 30c. Postage Due (uncancelled). The earliest recorded cover bearing this provisional issue  Estimate HK$ 6,000-8,000    provenance: Sir David Roseway,  W.H. Adgey Edgar, April 1971  Gunnar Hellström, March 1981                        
                                            
                
                    
                        Sold for                    
                        
                        
                        HK$5,200