sterling marks

Can anyone identify the hallmark on this sterling belt buckle? The mark looks a little like a sideward S.

Found in the yard of a home that was moved to the current site at the beginning of the 20th century, but the area was a town in the 1850s. There are no marks on the inside of the thimble. I am hoping somebody will recognize what I assume is the maker's trademark... Sterling broken up into two...