The only thing I can say for sure is that it is an AS of Augustus. There are a number of RIC numbers related to this large SC reverse. But without being able to see the full legends on the obverse and reverse it will be very difficult to say which one.
Thank you, all, for your input. Without being able to see the full legends I agree is impossible to determine which of the several RIC numbers featuring Augustus and the large SC it is related to. In my research I found that wildwinds.com and ancientcoins.ca provided excellent reference material.