Numbering from left to right, top to bottom:
#1: Spain 5 pesetas
#2: appears to be a replica of a Chinese "Hong Xian dragon dollar", though fantasies like #9 often have this dragon design on the other side.
#3: Spanish coin countermarked for use in the Philippines.
#4: Swiss "shooting thaler", Schnaffhausen 1865.
#5: Same as #1. It appears to be rusty.
#6: USA "Morgan" dollar.
#7: USA "
Trade dollar".
#8: USA "seated" dollar.
#9: Chinese fantasy piece from the "twelve Qing Emperors" set.
#10: USA "seated" dollar.
#11: USA "
Trade dollar".
#12: USA "
Trade dollar".
If they all came from the same place, then yes, they are all likely to be fake. Apart from the Swiss shooting thaler, they're all commonly encountered as Chinese-made fakes in the street markets.
A quick test for authenticity: if they stick to a magnet, they're steel fakes, not genuine silver coins.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis