50 Pfg. and 10 Pfg. overprint issue on form letter the pension regulatory authority being a Reich official matter from Opole 28. 10. 20 with violet double circle. Approval / censorship stamp "commission INTERALLIÉE DE administrative district ET DE PLÉBISCITE HAUTE-SILÉSIE DEPARTEMENT DE L'INTÉRIEUR" to Neisse, superb - very rare postmark!