When Harrison and Sons were printing the 'London 1980' International Stamp Exhibition sheet stamp for Great Britain, the die had to be re-cut, resulting in two types. The miniature sheet, which was printed after the sheet stamps only contains the re-engraved die.
STAMPS BY YEAR
Great Britain, London 1980
STAMP-RELATED ITEMS BY YEAR
Great Britain, London 1980 Harrison souvenir sheet
- The Complete Deegam Machin Handbook, Third Edition (2003), Douglas G.A. Myall
- Stanley Gibbons Great Britain Volume 5 Queen elizabeth II Decimal Special Issues, Specialised Stamp Catalogue (2000)