This gun's SN dates it to 1890 and other than the twist steel barrels, it's almost identical to my 1891 gun. William Larkin Moore's shop has it listed on online, but they mistakenly ID it as an "O Grade" gun. It's clearly "transitional" in that it still has the square barrel lump (mine is rounded at the front). That forend is all-wrong too (likely a replacement).