2c C of CA missing from wmk (Small thin), fine used. BPA Cert Cat £475. (Image)

1951 1.20 block of twenty the bottom four rows of the sheet with Plate 1-1 and BW imprint unmounted R8/4 with C of CA in watermark omitted this stamp with a very small natural inclusion. Stamp R9/1 shows part of the C in watermark omitted. A Rare piece. Cat £1380. (Image)