Please post a new question with much more detail. The coins' dates, denominations, and countries of origin are needed before any attempt can be made to estimate any values.
This is a huge question and needs a lot more information to answer. First, there are about 3 types of foreign coins out there, each with different values. First are collector coins, these are coins...
The U.S. did not strike any silver dollars for circulation after 1935. If your coins are from another country (e.g. Canada) please post a new question giving that information, as well as dates and...
US coins issued before 1945 were comprised of 90% silver (penny excluded), and have a much higher values than those issued 1945 or after (in general). in 1942-1945, many pennies issued were made of...