The 1901-S Barber Quarter is the most sought after Barber Head date and mint of the series and even in the lowest grades they can bring $2,000 or better. It's no wonder the prices this coin realizes in all grades especially higher grades; but these values are actually bargains when you compare the mintage of only 72,664 and then firgure their survival rate which is much lower. You also must consider that only one example has been graded MS68, so it's a super rarity that hasn't reached it's full potential.
The PCGS MS68 listed at number one above sold at Bowers & Merena Galleries’ March 2010 Baltimore Auction for $327,750 in 2010 but that was actually a decline from the $550,000 realized at Supior Auctions. Does this mean that now is a good time to buy ultra-rarities? It could be since there's been other rare coins who have realized a decline, but with these low pops and survival rates a future increase is highly possible.
We can never know when or if this coin type will become more popular and the demand increases then so will their values, but if they ever do you will be glad you bought some of the key dates and semi-keys.
The above list is the Top Ten sold values for Barber Quarters and the number one coin on this list is the most this coin type, denomination and date has ever sold for publically.
These values do not apply to raw coins or coins in any other holder; these values only apply to coins graded and certified by PCGS (Professional Coin Grading Service) or NGC (Numismatic Guarantee Corporation). Also, a few of these coin holders have CAC (Certified Acceptance Corporation) stickers and this is considered further assurance that the coin is the grade and condition stated on the holder's label.
You can't buy or sell Barber Quarters United States coins for the prices listed in this website unless they're in the same grading company holder, same grade, variety and condition, even then there's no guarantee your Barber Quarters will sell for the same value.
If you want to learn the value of your Barber Quarter then you must know the coin's grade, condition, and if it's authentic. You do this by taking your coin to a reputable coin dealer or sending your coin to PCGS or NGC (fees do apply with these services). If you're not interested in sending your coin to a third party grading service then you should do some research and find a reputable coin dealer instead. I recommend a PCGS Coin Dealer since at least three of their piers have to vouch for them to be a PCGS Dealer.
If you can't find a PCGS Coin Dealer then look for local ANA members or coin clubs. In the mean time you can get an idea of your Barber Quarter's value and grade by visiting CoinHELP! website.