All coins have a date that they were minted, so by looking at the coin carefully, you will find the date the coin was minted.
Such a coin does not exist. The last British Halfcrown coin minted for circulation was minted in 1967. The last British Halfcrown Proof coin was minted in 1970.
The mint is the place where the coin was made. In the US there are several. If the coin has a D next to the date, it was minted in Denver. S is for San Francisco.
There was no 1977 British One Pound coin minted. The first general circulation One Pound coins was minted in 1983.
Possibly a typo for a coin minted in 1773.
anywhere
There was a USA dollar coin with Susan B. Anthony's face on it. It was minted at the end of the 1970's,
Yes and no. If your coin was minted in Denver it will have a "D" mintmark, however, if your coin was minted in Philadelphia, it will have no mintmark.
The George Washington dollar coin was the first of the Presidential dollar series. It was minted in 2007.
There was never a 2 Florin coin minted in the 20th century.
The last British Crown (5 Shillings) coin to be minted was the 1965 Churchill Commemorative.
It is extremely unlikely that a 2000 general circulation coin would be minted in 2001. It is not so unlikely that some bullion Proof coins might be minted in the year after the date indicated on the coin.