Before I comment on any coins I will show here let me say something about putting a value on a coin.
The value of a coin on the numismatic market is dictated by a complex mixture of factors. One feature that those unfamiliar with coins often mistakenly believe to be of great importance is age. That age is a minor contributor to value is illustrated by the fact that the 1969 Large Date variety 10 cents is worth more than the 1870 10-cent piece, a coin nearly 100 years older!
Basically, a coins's value is determined by a combination of supply and demand. The 1870 50-cent piece does no command a premium as the 1921 coin of the same denomination because there are many more 1870s than 1921s available.
Finally, the state of preservation of a coin markedly influences its value. It is not unusual for a uncirculated (brand new) George V sivler coin, for example, to sell for 100 times what a coin of the same date and denominatin would bring in well-worn condition.
I will explain grading later.