1913年北京参议院寄蒙古议员德色赖托布公函封1件,贴伦敦版蟠龙加盖楷体中华民国1分1枚,销北京二年(元改二)七月十九英汉文腰框戳,邮戳清晰,保存完好,为民初反应中蒙问题之难得实物资料ChinaPostal HistoryRepublic of China1913 (19 July) Offical envolope from Peking Senate to Mongolian MP, bearing C.I.P. overprinted R.O.C. 1c. tied by Peking bilingual c.d.s.