British army postal service free of charge letter of a member of the Royal Engineers (R. E. ) from Katowice to sandwich (Kent), violet official stamp single circle INTERALLIED PLEBISCITE commission OF UPPER SILESIA / controllers / OF / RAILWAYS / Katowice (Interalliierte Commission for the voting in Upper Silesia / the tally clerk the railways in Katowice), this official stamp is in the OS handbook unlisted, transport traces