Small caliber, low power. Short barrel, accurate to about arms length I'd guess.
Recoil would hurt, really hurt, but not as bad as the fistfight you'd get into without it, also you might also get some mild powder burns off the muzzle, though six shots wouldn't be enough to heat the gun itself noticeably.
Since it's hidden on a ring you could probably get close enough to get a good shot at what ever part of your target you wanted to hit, you could possibly take a swing at the guy, shoot him, and then hit him all in one motion.
It looks lit it was made back in the day when concealed weapons for personal defense were more common and better crafted, look at the engraving this is a piece of art, due to this fine craftsmanship it should also be reliable, as long as it doesn't fire all barrels at once like the old pepper-box guns were known to, and since it uses pinfire ammo like many of the old pepperboxes this is a distinct possibility
Also it looks like you need a workbench and screwdriver to reload it.
After you empty it I suppose you could also use it as sort of a "brass knuckle"
There is also something to be said about the intimidating quality of just having a gun regardless of how effective it may or may not be.
Sorry about the ramble, in answer to your question; it would sting and there might be some minor burns, but it would still be an improvement over fisticuffs, and again "I've got a gun" tends to have an effect on people.
You might also be interested in:
Palm-squeezer pistols
http://www.genitron.com/unique20.html
Or the infamous Apache revolver/knife/knuckle duster
http://en.wikipedia.org/wiki/Apache_revolver
The iphone of 19th century arms:cool:
Yuki-Anne wrote:I can see this ending up in a manga.
I think this one's more likely to turn up in a manga:
http://neveryetmelted.com/2010/11/24/rube-goldbergs-48-shot-revolver/
...Or a deleted scene from
Back to the Future III. I dunno.