Azerbaijan mail cover 1923

Registered cover from Azerbaijan to Switzerland.1923 TRANSCAUCASIA FEDERATED REPUBLICS, 1923, registered cover to Switzerland, franked on reverse with 35 kop star overprint, two pair 1r imperf (Sc 4,8) and pair Azerbaijan 500r / Sc 29) all tied by BAKU c.d.s.'s. Front shows Baku Registration label and reverse bears Baden / schweiz arrival c.d.s.