That depends quite a bit on what you have! Are your foreign(*) coins current circulation pieces? What country or countries are they from? If they're current issues (e.g. Japanese yen, British...
Looking a coin up in a reference book will tell you the ASW or actual silver weight of the coin, as well as the percentage of silver. US silver coins were 90%, while many world coins have different...
Cull coins or banknotes are those which have been sufficiently damaged or worn, or any combination of either, which makes them undesirable as collectibles.
Yes, but it depends on the coin, the year, the condition and the country of origin. Modern foreign coins are unlikely to bring a premium over the equivalent face value of them unless they are...