TANNU TUVA. 1928-42, attractive collection, on written up exhibition pages of 35 covers showing variety of frankings to domestic and foreign destinations (Switzerland, USA) with array of issues as single, multi (blocks of four) or mixed frankings. 3 Very nice covers franked with provisional surcharges of 1932-33 and 1933 issues (3 values 15/6k both types and 2 values 35/15k). Air mail issues on covers and 1941 animals changed colours issue covers noted as well. Great potential and opportunity for students of this elusive area. Viewing highly recommended. (Photo). Est. 2 500 - 3 000 CHF.