Need Help IDing this single shot

[sheepherder]

Dueling pistol??? They were usually made in sets...I see a "2" on that one; do you have another with a "1" on it???

Here's a couple pics of a Remington rolling block target pistol...You can see the resemblance...





I've seen the Remington's displayed in cased sets; engraved, sometimes plated, always beautiful...