This one is probably the hardest to describe.
First given to Members of Congress, this pistol is an 1859 Volcanic made by New Haven Arms.
Only 800-900 ever made of this model between 1857 and 1862. Which in gun terms, is....tiny.
This lever-action design was the exact predecessor that evolved into the Henry and Winchester rifles.
In 1859
"The standard version of the No. 1 Pocket Pistol sold for $12.00 with a polished brass frame, blued barrel and magazine, case hardened hammer and lever and two-piece wooden grips. For an extra $1.50, the pistol could be had with a silver plated and engraved frame."https://collegehillarsenal.com/new-haven-arms-no-1-volcanic-pocket-pistol