Mark, Congrats on your new find!
I have serial #15901, a 10 gauge hammer gun with 30in "Plain Twist"steel barrels,delivered in 1881 at a cost of $55.00.
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"Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy