Bidspirit auction | Soviet Union - Commemorative Issues

Soviet Union - Commemorative Issues of 1933-35 - 1935, Moscow Spartacist Games, Hurdling, 35k deep ultra and black brown, used on registered philatelic exchange cover from Moscow to Switzerland, exchange tax stamp 15k/70k of the 6th issue is affixed on reverse and tied by 8-line official cachet, Bern arrival is alongside, VF and very scarce franking, Est. $500-$600, Scott #567