Revolver

In my opinion, yes
Under federal law no(any firearm built before 1898).

Whether or not it is an "antique" depends on what definition you want to use.

26 U.S.C. § 5845(G)

"For the purposes of the National Firearms Act, the term “Antique Firearms” means any firearm not intended or redesigned for using rim fire or conventional center fire ignition with fixed ammunition and manufactured in or before 1898 (including any matchlock, flintlock, percussion cap or similar type of ignition system or replica thereof, whether actually manufactured before or after the year 1898) and also any firearm using fixed ammunition manufactured in or before 1898, for which ammunition is no longer manufactured in the United States and is not readily available in the ordinary channels of commercial trade."

Note the "For the purposes of the National Firearms Act...". So that's a legal definition that used when applying that law. The "common usage" definition of antique is something that's 100 years old. This is what they usually use for furniture, etc. Cars are commonly considered antique if they are at least 50 years old. But many states define antique cars as something else (like 25 years) for licensing purposes. That would be a legal definition applicable only within that state.

To me that could be called an antique as it's 100 years old and the NFA does not apply in this case. Assuming your state does not have a law on the books that would define that particular weapon as an "antique firearm".

Repeat, if made in 1899 - I was hoping somebody with Mr Goforth's book would come along - it is not NOT NOT an antique as defined in Federal law.
The last gun made on December 31, 1898* is an antique, the first identical gun made on January 2, 1899** is "modern."

*The law is "manufactured IN or before 1898", "pre 98" is not correct.
**January 1, 1899 fell on Sunday.

Common usage for furniture and personal opinions do not count.

And that would classify it as a modern firearm - not an antique. Good information to have.

Relle said:

Is this gun consider a swift model

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I do not think so: https://www.gunvaluesboard.com/the-swift-revolver...-the-original-owl-head-13980.html

A reproduction of an antique for example would be any of the cap and ball revolvers currently being made. There is a very loyal bunch of reproduction C&B shooters right here on THR.

I think they sold some Italian cap and ball revolvers under their brand name.
Reproduction top break Saturday Night Specials? No.
They made somewhat modernized top break .22s up into the 1950s or 1960s. A store here has a H&R 999 but I have not seen a postwar IJ.

mustanger98 said:

If it's the gun I'm thinking of, from the time frame I'm thinking of, anybody could walk into any country store in the South and buy one for ~$2.50.

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"Give me two cans of sardines, a gallon of kerosene, some chewing tobacco, and a .38 Iver Johnson."

"You bet. Need any shells?"

"Yup, and a can of peaches, thanks kindly."

Old Stumpy said:

"Give me two cans of sardines, a gallon of kerosene, some chewing tobacco, and a .38 Iver Johnson."

"You bet. Need any shells?"

"Yup, and a can of peaches, thanks kindly."

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"And put it on my bill." Sharecropper, likely... it'd get paid off on delivery of harvest.

I can answer that if you use modern smokeless ammunition in a gun designed around black powder, and specifically in the gun you have, you will at the very least cause undue wear and stretching of the latch.

I have nearly the same model of gun from exactly the range yours is in, and less than 50 rounds of modern smokeless ammunition which I fired in it has caused the latch play to go from minimal, to almost enough to cause ignition failures and an unsafe condition.