The example below is PP58 a 1d. lake-red (SG 43 or G1) Plate 136 with a Wm. Dawbarn & Co., Liverpool type 19 overprint, reading downwards but in Yellow rather than black.
Unfortunately the overprint does not show up very well on the scanned image - even the enlarged one. It is certainly best seen with the naked eye. At some point in the future I shall attempt to produce a clearer scanned image.
