I KNOW it's a 1950S, but I checked on Lincoln Cent Resource, and could only find style 007('46-'47) and style 008 ('52-'74). So I have 2 questions. 1) Does the 007 just carry over until the next style? 2) I thought the thinner part of the S was always ontop? Could this be an inverted S mm?
It's called a " Trumpet Tail " . http://varietyvista.com/01a LC Doubled Dies Vol 1/San Francisco Mintmark Styles.htm