The first one is a Maria Theresa Thaler (is it the picture below?) and even though it says 1780 on it, they always minted them with htat date on, even now. Maria Theresa was the Archduchess of Austria, Holy Roman Empress, and Queen of Hungary and Bohemia. She was the only female ruler in the history of the Habsburg dynasty. The silver thaler was the currency of the Austrian empire and was very important for trade with the Levant and therefore became the most famous and most popular silver coin in the Arabian world. The reason why it says 1780 on is because due to the demand from Arabic traders, Maria's successor decreed that the 1780 dies could be used to strike the new coins. The Thaler lost its status as legal tender in Austria in the middle of the nineteenth century, but an edict of 1857 as well as the present laws of Austria, made sure that the mint at Vienna still produces the thaler down to the present day. The second coin you have is a Churchill crown minted in 1965 to commemorate his death. Even if it was in mint condition, it would be worth little more than £1 and in its grubby state, lesss than that. Most people agree it's quite a horrible coin and I doubt that you'll find a buyer for it. You could use it as something else though. For instance, the owner of this site sold one to a motorcyclist and it was welded to the side of the bike to block something I think and looked quite fetching. There are millions of other uses if you put your mind to work! Edit: I don't really know how much the thaler is worth