Published and designed by Andrew Hill International, Astcote, Towcester NN12 8NW, UK email@example.com 01327 831594
These wonderful stamps were issued in 1990 to mark the anniversary of the 1d Black. Although they were only around for a year or so with six individual values, many of the 15p and 20p values were issued in booklets producing one or two imperforate edges. My list has 17 versions of the 20p that are quite distinct and worth looking for. In total I list 33 items, including two 1st Class stamps issued later in the Design and British Postal Museum & Archives books.
There has also now been a 175th Anniversary but just five items for this!