One Troy Ounce...

The details look worn and probably cast, which is the usual way to make counterfeits. But anyways, they're probably only worth metal.

G'day, I'd be suspicious, because of the lack of definition in the strike.
I suggest:
first, check the weight. Ought to be 31.1 grams.
if the weight is OK, check for density. I don't know any easy way to do this, except to compare the dimensions of this item to a known silver coin of similar weight: if this item is a lot thicker, you'd know that it was made of something less dense than silver. Possible comparisons: Spanish Dollar, or any of its derivatives are about 29g.
Peter in Oz

I'm with Peter on this one, weigh em :)

No they're not. They're worth about $12/each after confirmed as silver.

The strike looks like standard Chinese counterfeits and were not produced by any legitimate US bullion company. But as stated the only 100% way to tell is to weigh it

Can't remember who has the statistic about silver counterfeits. Someone stated that in extremely rare cases that larger silver coins actually had the correct weight. The counterfeiters were more interested in design and mass production instead of correctness of weight.

But yes a density test would be a swell addition to weighing it

But this is not a counterfeit coin, is it? It is a round. The weight does not prove (or disprove) anything.

If it weighs short, it weighs short.

But it doesn't guarantee that it isn't silver. Certainly someone somewhere has tried to stiff people by making underweight rounds.

But my main point remains that it doesn't prove anything if it *does* weigh exactly one ounce.