A most curious mahogany case, full of original accessories. The top gun is a Joseph Manton with it's original barrels. The lower gun is by John Krider, made to fit the Manton barrels. It is difficult to figure out why two sets of stocks and receivers and one set of barrels which perfectly fit each receiver. The case contained Krider sourced accessories including a powder flask marked with the name of a Mr. Duncan and dated in the late 1870s as I recall. The case is also marked in brass with Mr. Duncan's name.
The Krider made stocks and locks
The Manton stock and locks