138240 1951 2D PALE RED-BROWN (SG506) USED EXAMPLE WITH ERROR OF WATERMARK AND SHOWING INCORRECT CROWN.

1951 2D PALE RED-BROWN (SG506) USED EXAMPLE WITH ERROR OF WATERMARK AND SHOWING INCORRECT CROWN. A fine used 1951 2d pale red-brown (SG506), wavy line cancellation, with most unusual and very rare ERROR OF WATERMARK AND SHOWING INCORRECT CROWN where the crown has fallen off the dandy roll and has been replaced by an incorrect Crown watermark. The only example believed to exist and I remember seeing this variety described as such in a mixed lot in a Plumridge auction in the 1980s/1990s. Nice to handle it many years later. BPA cert 37151. A very rare variety. (Ref 138240).