You can collect anything you want. Nothing wrong with keeping them. The ancient may be a little better, but I can't really see what you have based on the pics
Here are some sites where you can look them up. You should be able to find most of your coins .
From what I can se from your threads, almost all are worth from just a few cents to maybe 2-3 per dollar. Most dealers sell coins like this by the pounds. Sorry, but they are a nice selection of world-wide foreign coinage. They would be a good start to a junior collector.
Some nice stuff. Do you want a collection you can enjoy perfect. Do you want a collection which will make you alot of money, not perfect.
Well that Mexico 10 Pesos is a current coin of Mexico worth about 50 cents.
Show me the other side of the 1973 Mexico 20 Centavos please....
The ancient Roman Vespasian coin may have some value. Most of the modern foreign would be bought by the pound as others have said.
Mostly just pocket change from tourists.
The 1942 French franc is interesting in that it was issued in German-occupied France. But it doesn't have much value.
The ancient coin looks interesting. Can you take pictures of both sides? Is it bronze or deeply toned silver?
I believe its bronze and heres the back of the 73 20 centavos as well