1918. Provisories. 27 Ear and labyrinth disorders: Planche with 8 values overprinted COLONIAS and 12 marks overprinted SPECIALEN COLLECTION MAURITANIE. The marks were distributed via UPU to the postal services of the Member States. The marks are overprinted in Portugal and come from the Angolan Post Office. Only known sets on private hands. Ex. Niels Kristian Hansen