I do believe this may be a doubled die but I will wait for some experts to shoot me down. Usually when I feel the most confident about a coin its the biggest whammy. Is it is indeed one , is there much value in it?
I agree with Islander. There is only 1 for this year-mm. http://www.varietyvista.com/01b LC Doubled Dies Vol 2/DDO 1973-S.htm
There's another one listed by Wexler but IMO yours is not a Doubled Die. http://doubleddie.com/823881.html