Fake or Real?

[cladmaster]

Hello all,
I'm trying to figure out two things about these coins. First, are any of them real? Second, are they silver and is there any way I can test them at home without purchasing any kind of special kit? I bought these coins in Singapore about 12 years ago for around 30.00 bucks. I've done a little research and believe some of the foreign coins may be the real deal and definitely believe the US coin is a replica/fake. Also, when I run these under my detector they show one notch about the penny on the ACE. I've run similar size silver dollars under the ACE and it shows as a dollar so this little test makes me believe they possibly may not be silver. I scratch the replica/fake US coin to see the underlying metal but it still looks silver in the scratch. The coins feel heavy in weight comparable to a large silver dollar. Please take a look and let me know what you think. I'm open to any advice you may have.