10 Gr and 1 Zl on international registered letter Cracow 5.3.41 to the Polish Interned Hochschullager in Winterthur / Switzerland, reverse OKW-censorship as flow path censorship, Swiss box cancel of 2 lines "delivered / field post office" and red "routing label. Army postal service. ", reverse arrival "army postal service / Poste de Champagne 13.3.41"