The 1999-S Delaware State Quarter is worth anywhere from $3 in lightly circulated condition to over $15 or more for top-grade proof examples, making it a surprisingly interesting find for everyday coin hunters.
If you stumbled across a 1999-S Delaware quarter in an old coin jar or inherited collection, you’re already ahead of most people. The “S” mint mark tells you this coin was struck at the San Francisco Mint — and that changes everything about its value. Unlike the Philadelphia or Denver versions struck for everyday use, the San Francisco mint produced these quarters specifically as proof coins for collectors. To quickly figure out what you’ve got, many people use a coin identification app to get an instant read on the coin’s details before diving deeper into its value.
What Makes the 1999-S Delaware Quarter Special
The 1999-S Delaware State Quarter holds a unique place in American coinage history. Delaware was the very first state released in the 50 State Quarters Program, which ran from 1999 through 2008. That means Delaware wasn’t just another quarter — it was the one that launched a collecting craze that swept the entire country.
The reverse design features Caesar Rodney on horseback, commemorating his famous midnight ride during the American Revolution. The obverse carries the traditional George Washington portrait. The San Francisco “S” mint struck these exclusively as proof coins, meaning they were made with specially polished dies and hand-selected planchets for a mirror-like finish. Proof coins were never intended for circulation — they went directly into collector sets. If yours still has sharp cameo contrast between the frosted design and reflective fields, that’s a very good sign.
Understanding the 1999-S Delaware Quarter Value by Grade
Not all 1999-S Delaware quarters are worth the same. Proof coins are graded on the standard 70-point Sheldon scale, and condition matters a lot. A proof coin that has been handled, scratched, or stored poorly will lose significant value. Here’s a general breakdown of what you might expect:
| Grade | Description | Estimated Value |
|---|---|---|
| PR 65 | Choice Proof, minor blemishes | $3 – $5 |
| PR 67 | Superb Proof, minimal contact marks | $6 – $10 |
| PR 69 | Near-perfect, full cameo contrast | $10 – $18 |
| PR 70 | Perfect Proof, flawless surfaces | $20 – $50+ |
For more detailed and up-to-date pricing on specific grades, you can browse current market data for the 1999 Delaware State Quarter across multiple grades to see how recent sales stack up.
How Mint Mark and Mintage Numbers Affect Value
The San Francisco Mint produced approximately 3.7 million 1999-S Delaware proof quarters. While that sounds like a lot, proof sets from this era have seen significant collector demand, and many coins have been lost, damaged, or broken out of their original packaging over the years. That steady attrition means pristine examples are harder to find than the mintage number suggests.
Compare this to the Philadelphia and Denver versions — each struck over 370 million coins for general circulation. The sheer rarity of a well-preserved proof coin from San Francisco gives the “S” version a clear edge in the collector market. If you’re trying to understand all the variables that go into a complete picture of what your 1999 quarter is truly worth based on mint mark, grade, and variety, it’s worth consulting a reliable reference before selling or trading.
Tips for Getting the Most Out of Your 1999-S Delaware Quarter
If you think you have a high-grade example, resist the urge to clean it. Cleaning coins — even gently — is one of the fastest ways to destroy their value. Any cleaning, even with a soft cloth, leaves micro-scratches that professional graders will immediately spot.
Consider submitting your coin to a third-party grading service like PCGS or NGC if it appears to be in near-perfect condition. A certified PR 69 or PR 70 coin in a sealed slab will fetch noticeably more on the open market than a raw, ungraded coin. For everyday sorting and initial identification, CoinKnow is a highly rated app that helps you identify coins, understand mint marks, and get quick value estimates — great for those just starting out.
If you’re building a set of all 50 State Quarter proofs, the Delaware coin is an essential first piece. Many serious collectors use CoinKnow to track their entire collection, compare prices, and get alerts when specific coins hit target price points.
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FAQ
Q: Is the 1999-S Delaware quarter rare?
A: It’s not extremely rare, but it’s less common than the circulating Philadelphia and Denver versions. With around 3.7 million struck as proofs, high-grade examples in PR 69 or PR 70 are genuinely hard to find and worth more to collectors.
Q: Can I spend my 1999-S Delaware quarter like regular money?
A: Technically yes — it’s still legal tender worth 25 cents. But given its collector value, especially if it’s in great condition, spending it would be a mistake. Have it evaluated first using a tool like CoinKnow or take it to a local coin dealer.
Q: What’s the difference between a proof quarter and a regular quarter?
A: Proof coins are made with specially prepared dies and polished planchets, giving them a mirror-like background and frosted design details. They’re made for collectors, not circulation, and are generally worth more than their circulated counterparts.
