This may be the first of a multi-part installment. Found a jar of old coins in mother-in-law's house when she moved out. I'm not sure if these are authentic, however they were placed in an area with other collectibles. They all seem to be coated with a sealant/protectant, hence a very glossy and smooth surface. Since I have no other coins like these to compare with, I need your opinion and comments. If possibly authentic, please help identify. THANKS!
The first five coins are shown below. I can get exact weights and measurements, but they are all approx. US half-dollar sized.
COIN #1:


COIN #2:


COIN #3:


COIN #4:


COIN #5:


this coin is thick! Compare to a modern US nickel:
