is this an antique knife?

The OP's knife has not the same stamp marks : notice the three equal bars on handle side and the absence of logo (could be rusted away, though). Compare to the knife shown by Arathol (I have the same, 15 years old) : the stamped bars on the handle side are different. So.... there actually is a difference : OP's could be older than Arathol's. Not saying it is an antique. Those OH knives were and are hard users. The odds are low that such a knife gets over a century old.
 
Fun fact, and for the sake of definition, The US Customs Service defines an "antique" as a man-made item 100 years old or older. Since they deal with laws regarding the import and export of antiques, I figure their definition is probably most accurate.

Items older that 20 years, but under 100 years old are typically defined as "vintage". I don't believe the USCS has a legal definition of "vintage".

Just some of the interesting things you learn when you date an antiques dealer 😁.
That is certainly not conclusive. In many states you can get antique plates for a car 25 years old or older.
 
T
That is certainly not conclusive. In many states you can get antique plates for a car 25 years old or older.
That's because states just want the money. They aren't experts in antiques, just spending your money and taking more.
The knife could also be a post war Japanese knock off of the Ontario.
 
T

That's because states just want the money. They aren't experts in antiques, just spending your money and taking more.
The knife could also be a post war Japanese knock off of the Ontario.
In my state an antique plate is way cheaper because it never has to be renewed and the car doesnt get inspection or emissions any more. But in general you are correct.
 
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