There are numerous rare and collector coins -- both minted in the United States and other parts of the world. The value of these coins can fluctuate and some, like bullish rare coins, are expected to have continued price advancement over the years. Bullish rare coins are the ones with demonstrated growth rates and area of great value to collectors. You can check with coin value tables to keep up with the current value of these and other rare coins.
1856 Flying Eagle Cent
The Flying Eagle cent is the inaugural small scent that was minted in 1856 in Philadelphia. Only 1,000 were minted. This rare bullish U.S. coin is accepted in any condition and has seen steady appreciation throughout the years. Coin valuators expect the value to keep increasing as it's "necessary" to complete small cent collections and is available in extremely small quantities. Collectors are advised to get their 1856 Flying Eagle cents from reputable sources, as 1858 Flying Eagles have been altered to look like the 1856 version.
1913 Buffalo Nickels
There were two types of U.S. Buffalo Nickels made in 1913 because the date (1913) and denomination "FIVE CENTS" were wearing down too quickly with the first batch (Type 1). Thus engraver Charles Barber eliminated the mound and stood the buffalo on a straight line, creating a recessed area below the line where the denomination was protected. The nickel with the straight line is referred to as the Type 2 Buffalo Nickel. The 1913-S Type 2 Buffalo Nickel is highly prized by collectors, proven by the price hikes as time went on.
The 1916-D (dime)'s value is continually growing as it is the key coin of the Mercury dime set. Atypical of other rare coins, the value growth of lower grades of the U.S. 1916-D outpaces the value growth of pristine grades. Coin valuators credit this to the steady purchasing of collectors of average financial means seeking to complete their Mercury dime collections. Collectors are warned to never buy this coin from questionable sources as many Mercury dimes have been altered to resemble the 1916-D.
1918-S, 8/7 Overdate
The U.S. quarter coin is used faster than any other denomination, U.S. Coin Values Advisor says. It was first minted in 1796 and any quarter between then and 1964 generates numismatic interest and consistently increases in value. These rare quarters include the Standing Liberty quarters, which were minted from 1916 to 1930. There are only a few members of this group left for collectors.
One such member is the 1918-S, 8/7 overdate. This variety was made when two hubs carrying different dates were used together to make a 1918 die and the overdate wasn't noticed until 20 years later. No one knows how many 1918/7-S quarters exist. It is one of the most legendary and sought after U.S. coins.