I have these 4 really old coins, and I have no idea what they are, so I need some help!
The weight, thickness and diameter of each are below.
Thanks!

2g, less than 1mm thickness, 25mm across
2g, about 1mm thickness, 21mm across
3g, about 1mm thickness, 22mm horizontally, irregular
less than 1g, less than 1mm thickness, 24mm across, feels like plastic, sounds like metal. 
