This lists "3 light brass cannon, 12 pounder" which were inventoried at West Point in 1801. This is something else not mentioned in anything I've read, so are there any surviving examples of this weapon? Perhaps the piece now at Fort Ticonderoga marked on the breech with "No. 20" and the weight (works out to 1300-odd pounds as I recall) is one of them, but we'll have to wait for the snow to melt before anyone can measure the bore on that piece.