The most famous circulating counterfeit nickels were made in 1954, when a man named Francis L. Henning produced over half a million fake nickels dated 1939, 1944, 1946, 1947 and 1953. Today these coins are universally known as "Henning nickels".
Henning was caught because he used the same reverse design for all five dates. He forgot (or didn't realize) that unlike the other dates, genuine 1944 nickels carried a large mint mark over the dome of Monticello. The large mint mark identified them as special "war nickels" that were made from late 1942 to 1945 using a different alloy because of wartime metal shortages.
Henning never fully explained why he chose to counterfeit so many low-value coins; it's thought that he may have hoped to escape detection by going "under the radar" by faking coins that few people would be curious about.
By the time he was found out, he'd put roughly 100,000 coins into circulation, but said dumped the rest in local rivers when he feared that he would be discovered. Several searches were made after his arrest but fewer than 15,000 of the hoard have ever been recovered.
Racketeer Nickels
Another famous nickel with a history of double fakery occurred in 1883. When the Liberty Head design was introduced the designers felt that it was sufficient to show the denomination as a large V (the Roman numeral for 5) without including the word "cents". Within a short time criminals noted that the coin's size was almost identical to that of a $5 gold piece and began passing off gold-plated nickels as a new $5 coin design. The coins became known as "racketeer nickels".
The Mint quickly modified the coin's reverse to include "cents". People now recognized racketeer nickels as fakes and began collecting them as curios and keepsakes. That led to a demand for more plated "no cents" nickels which still other crooks were happy to supply for years afterwards. In many cases it's extremely difficult to tell the difference between a so-called "genuine racketeer nickel"; i.e. one that was plated before the reverse design was modified, and a "fake racketeer nickel" that was produced years later. These coins remain particularly unusual because the counterfeits became sufficiently collectible that the fakes themselves were also counterfeited!
Other counterfeits
When the existence of 1913 Liberty Head nickels first came to light many counterfeits also turned up. These fakes were most often made by altering a digit on a 1903 or 1910 nickel. Today it's known that only five 1913 Liberty nickels were made and all are accounted for, so very few counterfeits now show up.
A more recent date that's faked was the 1950-D Jefferson nickel. These coins have the lowest mintage (2,630,030) of all Jeffersons. That figure was noticed almost immediately; it's estimated that as many as half of all 1950-D nickels were hoarded shortly after they entered circulation. That hoarding led to price spikes and of course counterfeiting. Like the faked "1913" Liberty nickels, similar dates such as 1958 would be altered; others were created by adding an artificial mint mark. In the 1980s and 1990s many of those early hoards were sold as people cashed in on high prices. As a result not only did counterfeiting effectively stop but the market was flooded to the point where a 1950-D nickel is quite affordable at $5 to $15 depending on condition.
1964
1913 was the first year of issue for Buffalo nickels. They were made every year until 1938 except for 1922-1932-1933.
The first Jefferson nickels were made in 1938.
1945 is the last year for the 35% war nickels. The composition was changed in late 1942 due to wartime metal shortages. ALL other US nickels, regardless of date, are made of an alloy of 25% nickel and 75% copper.
The only US nickels that ever contained silver were special "war nickels" made from late 1942 to 1945. All US nickels from 1866 to the present are made of the same alloy of 25% nickel and 75% copper. War nickels were made of an alloy of 56% copper, 35% silver, and 9% manganese because nickel metal was needed for the war effort. These coins are distinguished by a large mint mark letter over the dome of Monticello on the back.
Nickels are made every year. Millions or billions are produced.
No no no. The last year for buffalo nickels was 1938, and nickels have NEVER been made of gold.
1964
The US has never made coins from pure nickel. Canadian nickels were made of 99.9% pure nickel from 1922 to 1999, except during wartime due to metal shortages.
1913 was the first year of issue for Buffalo nickels. They were made every year until 1938 except for 1922-1932-1933.
It depends on the economy, they make as many as needed.
Zero
The first Jefferson nickels were made in 1938.
1945 is the last year for the 35% war nickels. The composition was changed in late 1942 due to wartime metal shortages. ALL other US nickels, regardless of date, are made of an alloy of 25% nickel and 75% copper.
The only US nickels that ever contained silver were special "war nickels" made from late 1942 to 1945. All US nickels from 1866 to the present are made of the same alloy of 25% nickel and 75% copper. War nickels were made of an alloy of 56% copper, 35% silver, and 9% manganese because nickel metal was needed for the war effort. These coins are distinguished by a large mint mark letter over the dome of Monticello on the back.
Yes. 39,557,639 nickels were struck that year, all at Philadelphia. Liberty nickels were made every year from their first release in 1883 to the end of the official series in 1912. There's more information at the Related Question.
No, Nickels are made from a mixture of 25% Nickel and 75% Copper.