Coins do not become valuable in any particular year.
They may start out being valuable because they may be made from gold or silver or other precious metals.
They may be valuable because they are rare. Some coins take years to become rare, others may be rare from the day of issue because of some error or other peculiarity with them.
The may become valuable because all coin collectors want one.
Yes. Also, there may be variations between coins of the same type that were minted in the same year due to them being minted at different mints.
Some more than others. For more valuable coins, they have to be pre-WWII. Postwar coins are only worth 3-10 cents each.
Some more than others. For more valuable coins, they have to be pre-WWII. Postwar coins are only worth 3-10 cents each.
No. They are just more valuable coins. These are the coins from least valuable to most valuable: yellow, red, blue.
Earlier years are more valuable than later coins. The more collectible wheat pennies are pre-WWII.
No they are not, in general just because a coin has a mintmark does not make it more valuable.
Because there are less of these coins than of others of that series. Since there are less collectors are willing to pay more.
They are not valuable, they are still in circulation and are worth 50 Pence. Newer coins only have some value if they are in mint uncirculated condition or, if they are Proof coins. Due to the extra work put into them and the metals they are made from, Proof coins are more expensive to buy in the first place.
In general, the earlier dates are less common and more valuable than later years. Most dimes before the 1930s have some premium. Coins from WWII generally sell for around melt value.
Just because a coin was struck at the Denver Mint does not make it more valuable. But some D mint coins are more valuable, it depends on the date, denomination and condition of the coin.
Yes, the materials used to make coins vary by country due to factors such as cost, availability, and historical traditions. For example, some coins may contain more valuable metals like gold or silver, while others are made of less valuable metals like copper or zinc. Each country's coins reflect its unique history, culture, and economic conditions.
Proof coins are always worth more than the circulating coins they resemble. Mint collector coins are different than circulating coins and need to be valued differently. Mint coins can come with several various types of surfacing, proof being one, bullion, burnished and brilliant uncirculated the others. The $50 gold coin has no circulating counterpart. It does have a similar brilliant uncirculated counterpart however. While ordinarily proof coins are more valuable than similar brilliant uncirculated coins this is not always the case. The lower amounts of brilliant uncirculated coins minted can cause these to become more valuable than the proof variety for the same year. 1986 had a relatively low minting of brilliant uncirculated collector mint coins and they are, for this and a few other years only, more valuable than the proof varieties. As is always the case with collectible coins, condition affects value. Hence any collectible coin needs an accurate assessment of condition before a specific value can be assigned. Values for these type collector coins are represented in "The Red Book" a semiannually published book listing US coin values.
For a numismatic collection the non-circulated coins are more valuable. The price difference between circulated an non-circulated coins is very important in catalogs.