Help Identify This lower Derringer

[M1XdColt]

Trying to find out the upper part of this Mouse gun. Anyone know what company makes this firearm.
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[M1XdColt]

A little update that I found is a look alike and which I believe it's a colt lord. Colt makes these sucker in brass Cooper. Still need to know what type of caliber it is

[recpark99]

Looks like Colt 22lr ?

[ojisan]

There are many companies that copied the Cot swing-barrel derringer design, legally and illegally.
While many were in what we now call .22 Short, there were other rimfire calibers back in the late 1800s.
Some of the bigger calibers were built on the same design but the frame and other parts were upsized to match.

The original cartridge was called .22RF (Rim Fire).
It wasn't called Short or anything else because it was the only one.
It had a small charge of black powder, so original guns from the day usually show some breech face, chamber and barrel bore pitting.

Note that modern smokeless powder .22 Short ammo is higher pressure than the old black powder .22RF and should not be shot in early BP guns.

[john myers]

https://www.bing.com/images/search?q=colt+22+rf+derringer+commemorative&qpvt=colt+22+rf+derringer+commerative&form=IGRE&first=1&cw=1129&ch=597

[nitroxdiver]

https://www.gunpartscorp.com/gun-manufacturer/colt/derringers-colt/lord-no-4

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