Doctors (with their notoriously illegible signatures) may be drawn to the newest writing instrument from David Oscarson. The St. Louis pen maker’s 23rd limited-edition pen pays homage to Alexander Fleming, the Scottish bacteriologist best known for discovering penicillin. The Alexander Fleming Limited Edition Collection is a touching tribute to Fleming’s impressive medical contributions, as well as a testament to the importance of the modern medical community. The limited-edition pens feature a rendition of Fl…