See
ebay UK site and search for title:
#255 Penny Black 'used' on cover (not!)
Stamps obviously replaced a 1d red as seller states
So 1 penny black does not belong on the cover
Stamp has a split in it above the queens crown
I am amazed anyone would want it and people are bidding on it,
why do they want damaged stamps? And wrong stamps that have been replaced on the cover?