Great Britain Stamp Issues of 1991 Dogs. Paintings by George Stubbs Issue Date: January 8, 1991 Greetings: 3rd Series ‘Good Luck’ Issue Date: February 5, 1991 Scientific Achievements: 1991 Issue Date: March 5, 1991 Greetings: 4th Series – Smiles Issue Date: March 26, 1991 Europa: Europe in Space Issue Date: April 23, 1991 Sport: World Student Games, Sheffield Issue Date: June 11, 1991 Roses: 9th World Congress of Roses, Belfast Issue Date: July 16, 1991 150th Anniversary of Dinosaurs Identification by Owen Issue Date: August 20, 1991 Machin Definitive: 1991 Issue Date: September 10, 1991 Bicentenary of Ordnance Survey. Maps of Hamstreet, Kent Issue Date: September 17, 1991 Christmas: 1991 – Illustrated Manuscripts from the Bodleian Library, Oxford Issue Date: November 12, 1991 Regional Machin Definitive – Northern Ireland: 1991 Issue Date: December 3, 1991 Regional Machin Definitive – Scotland: 1991 Issue Date: December 3, 1991 Regional Machin Definitive – Wales: 1991 Issue Date: December 3, 1991