Pakistan SG41/3 Khyber Pass 10r 15r and 25r violet in IMPERFORATE U/M blocks

1948 (-57) type 13 Khyber Pass 10r magenta 15r blue-green 25r violet each in an IMPERFORATE marginal block of 4 unmounted o.g. The complete set in this design. Minor gum bends but the 15r and 25r matching from left of sheet with centre guide (and unique thus). Original Purchased from Stanley Gibbons (Still on their card)