These grand old silver coins were minted when Carl XII was king of Sweden, hence the large 'C' monogram on the front. They are nice collectible pieces. Coins that have been authenticated, graded, and encapsulated by PCGS, NGC, ANACS, and ICG are generally worth a little more than 'raw' loose coins.
Here are some approximate catalog values for these coins.
worn: $40 US dollars approximate catalog value
average circulated: $120
well preserved: $300
The coin in our main picture at the upper left is in superb shape, better than our 'well preserved' criteria. It has great color and almost no wear. Its pleasing eye appeal adds to value. It is a $350 coin.
To the right is the coin submitted by inquirer leeb. Note that leeb's coin has quite a bit more wear than the one in our main picture, and its eye appeal is not quite as good. Leeb's coin is a $120 item. If it were scratched, stained, nicked, or otherwise damaged, the value would be much lower. If Leeb made a mistake and cleaned his coin, the value would go almost to zero.
NEVER CLEAN A COIN. CLEANING RUINS VALUE.