French army postal service free of charge letter of a assistant of the military office (Departement Militaire) the Interalliierten governmental commission for Upper Silesia to St. Pair sur Mer (Dep. many a), violet official stamp commission INTERALLIEE DE administrative district ET DE PLEBISCIOTE DE hewed SILESIE / DEPARTEMENT / MILITAIRE (unlisted in the OS handbook), arrival postmark single circle ST. PAIR S / MER / 13 -5 20 many a, at back, signs of transportation, signed Z. Mikulski