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 and is only really visible under natural light. It is certainly best seen with the naked eye. At some point in the future I shall attempt to produce a clearer scanned image.