6 May 2015 - 175th Anniversary of the Penny Black.
The 175th anniversary of the Penny Black was marked by a miniature sheet of 4 x 1st class stamps. The modified 1d black and 2d blue stamps, modified with the profile of Queen Elizabeth II and the denomination 1st.
The miniature sheet has conventional gum.
A self-adhesive 1d black stamp is available in books of 6.
Self-adhesive versions of the 1d black and 2d blue are also available from Generic Smilers Sheets, the only source of the self-adhesive 2d blue. (Now out of stock)