The 1999-S Pennsylvania Silver State Quarter is worth anywhere from $10 in standard Proof condition to over $100 for high-grade Deep Cameo specimens. While your average pocket change is usually made of copper-nickel, these special silver editions were minted specifically for collectors and carry a significant premium due to their precious metal content and mirror-like finish.

Condition / Grade	Estimated Market Value
PR 65 (Typical Proof)	$10.00 – $14.00
PR 69 DCAM (Near Perfect)	$18.00 – $25.00
PR 70 DCAM (Perfect Grade)	$65.00 – $125.00
Silver Melt Value (Approximate)	$4.50 – $5.50

History of the 1999 Pennsylvania Silver State Quarter

The Pennsylvania State Quarter was the second coin released in the groundbreaking 50 State Quarters Program, which began in 1999. This program revolutionized coin collecting in America, encouraging millions of people to look at their change again. While the Philadelphia and Denver mints produced billions of copper-nickel coins for general circulation, the San Francisco Mint took a different approach for collectors.

To determine if you have a rare find or a common coin, you can use a top coin identifier app to scan your collection. These digital tools analyze the visual details of your coin to give you an instant assessment. The Pennsylvania design features the Commonwealth’s state outline, a keystone, and the statue “Commonwealth,” which sits atop the dome of the state capitol in Harrisburg.

The “S” mint mark on your Pennsylvania quarter signifies it was struck in San Francisco as a Proof coin. Unlike the coins you find in a vending machine, these were handled with extreme care and intended for presentation sets. For serious enthusiasts, the CoinKnow app offers a great way to log these silver finds and track their performance against market trends.

Differentiating Silver Proofs from Regular Quarters

One of the most common questions people ask is: “How do I know if my 1999-S Pennsylvania quarter is actually silver?” It is easy to get confused because the San Francisco Mint produced two types of “S” mint mark proof coins in 1999: one made of the standard copper-nickel “clad” composition and one made of 90% silver.

The silver version is the one that holds the most value. You can check the edge of the coin; a silver quarter will be solid silver-colored all the way around, while a clad coin will show a distinct copper stripe. Additionally, you can check the Pennsylvania silver quarter current market data to see how the spot price of silver influences the total worth of your coin.

Professional grading services evaluate these coins based on their “cameo” effect—the contrast between the frosty design and the mirror-like background. If you have a particularly shiny coin, CoinKnow can help you determine if it qualifies as a “Deep Cameo” (DCAM), which fetch much higher prices at auction.

Feature	Clad Proof (S)	Silver Proof (S)
Composition	91.67% Copper, 8.33% Nickel	90% Silver, 10% Copper
Weight	5.67 grams	6.25 grams
Edge Appearance	Visible Copper Layer	Pure Silver Appearance

Factors Affecting the Value of Silver State Quarters

The primary driver of the 1999-S Pennsylvania Silver State Quarter’s value is its condition, often referred to as “grade.” Because these coins were sold in protective plastic lenses from the Mint, many remain in excellent condition. However, if a coin was removed from its case and handled by bare hands, oils from the skin can tarnish the silver surface, lowering the grade.

Scarcity also plays a role. While millions were minted, “perfect” specimens graded at PR70 are rare. Collectors often browse through detailed 1999 silver quarter valuation records to see what the most recent sales at major houses like Heritage Auctions have yielded. A single scratch visible only under a microscope can drop a coin’s price by $50 or more.

Environmental factors like “toning” can also change the value. While most collectors prefer a white, brilliant silver look, some prize coins that have developed colorful iridescent patinas. If you aren’t sure where your coin falls on the spectrum, CoinKnow provides a gallery of graded examples you can compare your coin against.

The Rarity of High-Grade Deep Cameo Proofs

When we talk about the highest values for the 1999-S Silver Pennsylvania Quarter, we are almost exclusively talking about “Deep Cameo” coins. This designation is given by grading companies like PCGS or NGC when the contrast between the frosted devices and the polished fields is exceptionally sharp.

In the early years of the State Quarters program, the San Francisco Mint had perfected its techniques. However, as the dies wore down during the striking process, the “frosty” look would become less pronounced. Therefore, coins struck with fresh dies early in the run are more likely to achieve the coveted DCAM status.

If you believe your coin is a top-tier specimen, it might be worth the investment to have it professionally encapsulated. A PR70 Deep Cameo can bring a massive premium over a raw, ungraded coin. Check the weight carefully; silver quarters weigh 6.25 grams, which is a key indicator of its metal purity and authenticity.

Mintage Type	Quantity Minted	Rarity Scale
1999-P (Philadelphia)	353,600,000	Very Common
1999-D (Denver)	351,400,000	Very Common
1999-S Clad Proof	3,711,358	Uncommon
1999-S Silver Proof	804,565	Scarce

Tips for Selling and Collecting These Coins

If you have found a 1999-S Pennsylvania Silver Quarter, selling it requires a bit of strategy. For raw coins that aren’t professionally graded, your best bet is often a local coin shop or an online marketplace like eBay. These coins are usually sold for their silver melt value plus a small collector premium.

Before selling, always ensure you are not cleaning the coin. Cleaning a silver proof coin with any cloth or chemical will create “hairlines,” which are tiny scratches that immediately ruin the numismatic value of the coin. It is better to have a slightly tarnished authentic coin than a shiny, cleaned coin that looks artificial to a dealer.

For those looking to build a full set of Silver State Quarters, the 1999 coins are the most important to start with. Being the first year of the program, they often carry slightly higher premiums than quarters from the mid-2000s. Keeping them in their original U.S. Mint packaging is the best way to preserve their value for future generations.

FAQ

Q: Is every 1999-S Pennsylvania quarter made of silver?

A: No. The San Francisco Mint produced two versions of the “S” mint mark quarter in 1999. One is the standard copper-nickel clad version, and the other is the 90% silver version. You can tell them apart by checking the edge of the coin or by weighing them.

Q: Can I find a 1999-S Silver Pennsylvania Quarter in my pocket change?

A: It is extremely rare but possible. These coins were originally sold in protective sets, but sometimes they are spent by accident or removed from their packaging. If you find one in “the wild,” it will likely be scratched and worth mostly its silver melt value.

Q: How much silver is in a 1999-S Pennsylvania Quarter?

A: These coins are composed of 90% silver and 10% copper. They contain approximately 0.1808 troy ounces of pure silver. This means the value of the coin will rise and fall along with the global price of silver.

Q: Does a perfect PR70 grade really make it worth $100?

A: Yes, and sometimes more! Registry set collectors compete to own the highest-graded coins possible. A 1999-S Pennsylvania Silver Quarter that is certified as perfect (PR70) is significantly rarer than a PR69, causing the price to jump significantly.