applied diagonally, affixed to piece dated "10 Jan 87" and marked "No 61" at foot. Believed to have been used as a trial for the removal of cancellation ink. P.F.S.A. Certificate (1999). Photo" /> Proof £1 imperforate stamp-size proof in black on wove paper with background faded out and with manuscript<I> "Cancelled"</I> applied diagonally, affixed to piece dated<I> "10 Jan 87"</I> and marked<I> "No 61"</I> at foot. Believed to have been used as a trial for the removal of cancellation ink. P.F.S.A. Certificate (1999). Photo | Christie's