Cull coins or banknotes are those which have been sufficiently damaged or worn, or any combination of either, which makes them undesirable as collectibles.
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...
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...