Thats not 100% true with the megnets. I have had fake trade dollars and the magnet trick didnt work. The best way to know if it fake or real is a scale and caliper.
Here are a couple genuine (somewhat worn, LOL ) Trade Dollars. When one compares the coin in the OP you can see the difference. Take Care Ben
The OP's pics are not the greatest, but I don't see anything that would alarm me. Perhaps Aberlight could post some better pics ? I've been trying to compare it to the one I have, but havn't spotted anything that stands out.