Coin collectors love the US Mint proof set. These uncirculated proof coin sets usually include every denomination from that year or a theme-based set, and they can be highly valuable.

This super-valuable gold proof set provides proof that coin metal affects proof set values. Six gold 1859 uncirculated proof coins are included. They are protected by coin slabs and have face values from $1 to $20.

This 1856 nine-piece proof set is old and valuable despite not being made of gold coins. Every denomination from a half-cent to a dollar is in beautiful condition and proof. It sold for $199,750 in 2016.

People break up proof sets to sell the coins individually, making them scarce. Matte gold 1911 proof sets, produced in small quantities, typically exhibit this. Four coins from an experiment in matte vs. bright gold are in the set. In 1998, it sold for $161,000.

A proof set of gem coins, especially old and rare ones, is valued. This 1914 set comprises nine coins from pennies to rare gold double eagles. The set has four gold coins. This sold for $149,500 in 1999.

Despite not including gold coins, this 1895 six-piece proof set is quite valuable due to its quality and completeness. All denominations, from pennies to Morgan dollars, are in perfect condition. It sold for $141,000 in 2015.

Many proof sets without gold coins for that year are called "minor proof sets," but this 1890 10-piece collection is anything but. It comprises every coin from the penny to the gold double eagle, including several rare ones. It sold for $138,000 in 2010.

Despite not having gold coins, this proof set is very valuable due to its age. Many of these 180-year-old coins are in pristine condition. The dollar coin has environmental deterioration, but the others are gorgeous. This set sold for $105,000 in 2023.