1943 S Penny

Hello, I was looking at some purchased BU S steels last night and came across this. Is it a RPM?  I can’t find other examples of this error on the Internet for San Francisco. any help would be appreciated!  

Variety Vista reports some RPM's for 1943 S.

http://varietyvista.com/02a%20LC%20RPMs%20Vol%201/RPMs%201943S.htm

Thank you!!  I’m guessing west or north west variety?

Probably but RPM's are not something I spend much time on.

Gotcha thanks!