Hello Nathan & Welcome: If your SN is 1867 it's one of the first 20 in "The Book" which describes it as a DS Grade 12 gauge hammer underlifter, no extras w/ 30 inch barrels and a pistol grip stock. If the SN is 3867 "The Book" describes it as a D Grade 12 gauge hammer underlifter, no extras w/ 30 inch barrels. The primary difference would be the top rib description of the barrels. 1867 should read "DECARBONIZED STEEL" while 3867 should read "DAMASCUS STEEL". 1867 would have been made in or before 1874 while 3867 would have been made in 1875.
I hope that this helps, Best Regards, George
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