Long wait, but I have some information, if you still have the gun.
INA (Brazil) is the Military Arms producing company of Brazil. They made a version of the Madsen SMG (.45ACP) that I am told is very good and very reliable.
They wanted to make revolvers for police/military use, but Taurus and Rossi were already in place, and they started selling to the civilian market in Brazil. They are very popular and widespread. and they are not expensive - they are like the used S&W police revolvers of 10 years ago.
The one I have is .38 Special, about 2 1/2" barrel, blue with nice walnut grips. It looks like a combination of Smith, Rossi and Colt revolvers, and has coil springs like a J -frame S&W. Mine shows a lot of carry wear and is a bit loose, but everything lines up and it locks up alright. The bore is excellent, and the trigger is very good DA, great in SA mode. It is all steel, with a pinned barrel like my old S&W Chief Special. Finish is pretty good.
I bopught mine for pocket carry when I'm doing flea markets - I didn't want to carry my old Smiths or heavy 1911's and sweat all over them.
It seems to be pretty well made, and I think it is just what I was looking for.
Sorry I can't give you more information - They are mainly found in South America, but they were imported into the US for a while by FIE, who is no longer in business.
Hello, New gun owner, here. I've been gifted an INA .32 Tiger revolver. Is there a source that would be good for serial number lookups? It apparently is the one from Brasil not the imported Miami version. I read that they were given to Brazilian air force officers and some police but haven't seen a whole lot more information. Thanks for your time and expertise.