I know it's a S.C. State seal coat button and from the 1830's -40's but just not sure which issue. Was told it was a (sc3).
Any help would be greatly appreciated.
The best book for time-dating a button by its backmark ("American Military Button Makes And Dealers; Their Backmarks & Dates"), says the button-making company which manufactured your button was in business using the name "Ives, Scott & Co. / Waterbury" only from 1834 to 1836.
As others have told you, your find is listed in the Alphaeus Albert button-book as button #SC-3. It is a rare variation, made with a completely-flat face even though it is a 2-piece button. It was made during the very brief period between the end of brass 1-piece flatbuttons era and the start of "domed" 2-piece buttons.