What is the value of George 3 crown?

Answer 1

Assuming you mean a British George III Crown, it depends on the date and condition. Many of these coins are found with at least moderate amounts of wear and those in mint state or about uncirculated condition can fetch a premium, even for common dates.

1820 coins are worth the least, little more than bullion (about $25 or so at the time of writing) in worn condition or about $45 if in decent condition. Of course an uncirculated specimen can be worth several hundred dollars.

1818 and 1819 are worth moderately more, about $50 or so if in decent condition, although still little more than bullion if very worn.

However, the 1819 has a variety where there is no stops on the edge of the coin, this is worth about $55 or more depending on condition.

Being a short series, this is a pretty easy set to obtain a date run (only crowns dated 1818, 1819 and 1820 were produced for George III crowns, ignoring of course the Bank of England tokens and the "dollar" issues)

Answer 2

They made literally hundreds of different coins during George V's reign. Please post a new, separate question with the coin's date and country of origin.

Answer 3

About $35.