Plate error

Lot number 3784 Quality: 0

Penalty postage P42f "1907 - De Ruyter 50c." with "white line through D of Nederland", vf (NVPH €195)

Lot number 3785 Quality: 0

N° 106P "1921 - 4c. on 4 1/2c. violet" with broken 4, vf (NVPH €50)

Lot number 3786 Quality: *

N° 171 Af "1928 - 1 1/2 CEN plate error in corner block with other normal stamps", with certificate, vf (NVPH +€150)