The Allen patent in reference is quite interesting . Note that the left side of the receiver, with the hinge, is made out of one piece part of the barrel. Allen had a Patent for making composite barrels in this period.
Offered with these guns was a nice leather pouch containing 6 Allen Patent shells. These shells were similar to other early centerfires. The ones I have seen were steel.
Even more rare were the Allen primers for these shells . They come in a green faced box and examples are quite expensive.
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