The best thing to do is take it to a dealer or collector for their opinion.
By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
One way to tell is to check the weight. A genuine silver dollar should weigh 26.73 grams (slightly less if the coin is heavily worn). If the weight is significantly higher or lower, it's a fake.
No U.S. silver dollars have an Indian Head design, so if you have one it's not real. A genuine silver dollar coin dated 1851 would be a Seated Liberty coin. I have seen many 'fantasy' silver rounds with the Indian Head design with different dates, but they all have the 1oz .999 fine silver markings somewhere on the coin.
If you have any doubts on it's authenticity, have it certified by one of the top 3 grading services. All early US dollars are known to have been counterfeited.
Take it to a local coin collector and see what he or she says.
You can tell if silver is real by looking for markings like "925" or "sterling" which indicate it is sterling silver. You can also test it with a magnet (silver is not magnetic) or perform a nitric acid test (real silver doesn't react with it). Additionally, genuine silver tends to tarnish over time, while fake silver will not.
The best thing to do is take it to a dealer or collector for their opinion.
Sorry, silver dollars don't have genders.
You can use a magnet to check if a silver dollar is real - real silver is not magnetic, so if the coin is attracted to the magnet, it is not silver. You can also examine the coin for any seams or irregularities in the design that may indicate it is a counterfeit. Finally, have the coin authenticated by a professional numismatist or coin grading service for a conclusive evaluation.
By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
One way to tell is to check the weight. A genuine silver dollar should weigh 26.73 grams (slightly less if the coin is heavily worn). If the weight is significantly higher or lower, it's a fake.
No U.S. silver dollars have an Indian Head design, so if you have one it's not real. A genuine silver dollar coin dated 1851 would be a Seated Liberty coin. I have seen many 'fantasy' silver rounds with the Indian Head design with different dates, but they all have the 1oz .999 fine silver markings somewhere on the coin.
International Silver is, as far as I can tell, a brand owned by the Lifetime Sterling company, and is sterling silver, which is real silver but not pure silver.
Please rephrase question.
Better tell that to the US Mint as I am holding one in my hand as we speak.
Look for the mint mark.