This 2010 Medical Breakthroughs 1 crown coin cover is a first day cover by Mercury Covers. It celebrates medical breakthroughs in research and technology and hosts a brilliant uncirculated Isle of Man one crown coin and Royal Mail stamps. The coin features Inventions of the Modern World, Alexander Fleming who discovered the antibiotic drug Penicillin. Postmark cancelled First Day of Issue Royal Mail Paddington London W2 16th September 2010.