Unfortunately that SN is in a series missing from the surviving records, but should date to about 1890.
After completion of the purchase of the factory from L.C. Smith, unfinished guns and parts were then shipped from Syracuse to the new Hunter Arms factory in Fulton for completion, and were available until about 1892.
These "transition guns" have the large convex ribs on the bottom of the receiver, squared lug, and compared to Fulton guns, finer checkering and a wider forend with a duck bill and vase shaped ebony tip. There were usually no marks on the rib.
Courtesy of David Williamson