INTER-ALLIED COMMISSION - ECONOMIC DEPARTMENT, 2 1/2 Pfg to 5 Mark Steelworks and Dove of Peace 1920, complete set on philatelically inspired registered letter to Paris/France, double-circle OPPELN 19 8 20 * 1 f (OS handbook no. 237.18), violet double-circle official seal COMMISSION INTERALLIEE DE GOUVERNEMENT ET DE PLEBISCITE DE HAUTE SILESIE - DEPARTEMENT ECONOMIQUE (OS handbook no. II.5.a.), age and use wear typical of period