INTER-ALLIED COMMISSION - PLEBISCITE ADMINISTRATIVE OFFICE, 2 Mark dark brown, 2 Mark dark red-brown, multiple franking on letter to Birmingham/England, double-circle OPPELN 5 4 22 * 1 b (OS handbook no. 237.11), violet double-circle official seal COMMISSION INTERALLIEE DE GOUVERNEMENT ET DE PLEBISCITE DE HAUTE-SILESIE - SERVICE ADMINISTRATIF DU PLEBISCITE (OS handbook no. 1.1.x.c), rare combination of two shades of same denomination, age and use wear typical of period