1991 United States Mint Proof Set Value Guide

The 1991 United States Mint Proof Set is a quintessential collectible for numismatists, featuring five coins struck with polished dies and specially prepared planchets. Produced at the San Francisco Mint, this set is distinguished by its vibrant purple cardboard sleeve and sharp, mirror-like finishes that far exceed standard circulation quality.

What Is 1991 United States Mint Proof Set Worth?

The typical price range for 1991 United States Mint Proof Set is $15 - $20 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• The presence and condition of the original purple outer mailing box and COA significantly impact market price.
• Visual clarity of the plastic lens, specifically the absence of scratches, cracks, or clouding.
• The degree of 'Cameo' or 'Deep Cameo' contrast between the frosted devices and the polished backgrounds.
• Tarnish or spotting on the coins, particularly the copper cent, which can lower the value below the $15-$20 range.

How to Identify 1991 United States Mint Proof Set?

• Verify the 'S' mint mark on all five coins, indicating production at the San Francisco Mint.
• Check for the original 1991 purple cardboard outer sleeve and the sealed plastic lens case.
• Look for the characteristic frosted cameo effect on the portraits against a deep, mirror-like field.
• Confirm the set includes the Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, and Kennedy Half Dollar.

History of 1991 United States Mint Proof Set

Proof sets are special collections of coins produced by a mint using a higher quality strike and finish than regular circulation coins. The United States Mint began issuing annual proof sets in 1936, with interruptions during World War II. These sets are primarily intended for collectors and feature coins struck with polished dies and specially prepared planchets, resulting in a mirror-like finish and sharp details. The 1991 set, like others of its era, was produced at the San Francisco Mint and includes various denominations common to US coinage.