Bidspirit auction | Portugal. Indebted Postage? IP of

Portugal. Indebted Postage? IP of 50 reis of D. Carlos Mouchon, sent from Lisbon on July 28, 1897, with additional postage of 50 reis on the back, and arrival in Lourenço Marques on January 21. It was charged in Lisbon, 25 cents, inexplicably, as the postage of 100 reis via London was correct.