1990 United States Mint Proof Set Value Guide

The 1990 United States Mint Proof Set is a staple for numismatists, featuring five coins struck twice on polished planchets for a mirror-like finish. Produced at the San Francisco Mint, this set is historically significant due to the rare 'No S' Lincoln Cent error found in a limited number of original releases.

What affects the value of 1990 United States Mint Proof Set?

• Presence of the rare 'No S' Lincoln Cent error, which exponentially increases the set's value.
• The physical condition of the outer purple cardboard box and the clarity of the plastic lens.
• The absence of toning or 'milk spots' on the surfaces of the silver-colored clad coins.
• Market demand for complete runs of San Francisco Mint proof sets from the 1990s era.

How to Identify 1990 United States Mint Proof Set?

• Verify the 'S' mint mark is present on the Kennedy Half Dollar, Washington Quarter, Roosevelt Dime, and Jefferson Nickel.
• Check the Lincoln Cent for the 'S' mint mark; the rare error variety lacks this mark entirely.
• Confirm the coins are housed in the original clear plastic protective lens with the signature 1990 purple background insert.
• Look for the sharp, frosted details and reflective fields characteristic of the double-striking process used at the San Francisco Mint.

History of 1990 United States Mint Proof Set

Proof sets are specifically manufactured by the United States Mint for collectors. Each coin is struck twice on specially polished planchets using polished dies to create a mirror-like finish and sharp details. The 1990 set was produced at the San Francisco Mint and carries the 'S' mint mark. This specific year is famous among numismatists because a small number of sets were released with a Lincoln Cent that was missing the 'S' mint mark, though this particular set appears to be the standard variety.