Proof A large piece of wove paper deeply blued with prussiate of potash, showing four impressions in black comprising the lower row of the sheet [9-12], the first impression cancelled "3860" and all pen cancelled, then chemically treated in an attempt at removal, manuscript "Old Colour Black dipt P" in J.B. Bacon's handwriting at left; creased. S.G. Spec. DP20F State 2e. Photo in colour for part