The “LF161” revolver-carbine is part of what is called the “1st series” of the 1854 model, since the rear of the breech is in the shape of a “Chinese hat”.
However, it had to be manufactured towards the end of this series since the loading gate is already fitted with a pinch lip.
This detail appears on the revolvers 1854 and on the 7 mm in Double Action around June 1857.
To read the rest:
Left: 28 gauge,
Right : 12 mm