Bidspirit auction | Lot of five corner plate

Lot of five corner plate blocks of nine stamps, 3 by 3, from the Second Postage Due series. Values 5, 10, 20, 30 and 50 pruta, each block showing the plate number and the sheet number in its corner tab: 5pr plate 3 sheet 00717, 10pr plate 4 sheet 11846, 20pr plate 5 sheet 16728, 30pr plate 6 sheet 15851, and 50pr plate 7 sheet 17874. The 2pr value is not included in the lot. The reverse is photographed and shows full, clean original gum. Condition MNH, mint never hinged, exactly as photographed.