Palestine Currency Board, an uncut sheet of watermarked paper for £1 (25), intended for the issue of 1927 to 1944, featuring an olive sprig design, with minor ink and pencil annotations, folded twice, as produced, extremely rare, and most likely the only intact sheet of these watermarks to have survived (1 sheet, 25 papers)
BNB B102, Pick 7 £1,200-£1,600

These items are directly from the Portals Paper archive