Proof coins are special collectible coins, not meant for circulation, and have a distinct appearance due to their meticulous production process . Here’s how to identify them:
- Mirror-like background and frosted design elements: Proof coins feature a striking contrast where the recessed parts (fields) of the coin are highly reflective and mirror-like, while the raised parts (devices) have a matte or frosted appearance. This effect, known as “cameo contrast”, is a key identifier.
- Sharper details: They are struck multiple times (typically twice) with specially prepared and polished dies and planchets (coin blanks), resulting in exceptionally sharp and intricate details on the design elements.
- Squared-off rims: Proof coins often have rims that meet the edge at a 90-degree angle, unlike regular circulation coins that usually have slightly beveled rims.
- Mint mark: Most US proof coins since 1968 have the “S” mint mark, indicating they were produced at the San Francisco Mint. However, some earlier proofs lacked a mint mark, as the Philadelphia Mint produced them.
- Protective packaging: Proof coins are usually sold in special protective packaging from the mint, often accompanied by a certificate of authenticity.
To summarize: Look for a coin with a shiny, mirror-like background that sharply contrasts with a frosted design, indicating a high-quality strike and potentially the presence of a proof coin.
How do you know if a coin is proof?
Thanks for asking. Appearance. Proof coins are struck twice instead of just once like regular coins, but this one extra strike gives the coins a much shinier, clean-looking finish and makes the intricate details of the design pop.
How do you tell if a quarter is a proof coin?
Proof coins have a mirror-like background with frosted design elements. The Mint uses a special process of manually feeding burnished coin blanks into presses with specially polished dies. Each coin is struck at least twice to bring out the details in the design.
How to check if a coin is silver proof?
Silver is non-magnetic, so it will not be attracted to a magnet. Despite this, there is slight resistance when gently sliding a magnet down a straight and smooth silver bar. The resistance only happens with straight smooth items however. This resistance, coupled with non-attraction, indicate the presence of silver.