- 1968-P Washington Quarter: This is the most common type of 1968 quarter and is generally worth face value (25 cents) in circulated condition. Uncirculated specimens can be worth more.
- 1968-D Washington Quarter: The 1968-D quarter is less common than the 1968-P and may have a slight numismatic premium over face value. Uncirculated specimens can be worth more.
- 1968-S Washington Quarter Silver Proof: The 1968-S quarter was minted as a special silver proof coin and is made of .900 fine silver. Silver proofs are typically worth several dollars, depending on their condition and desirability to collectors.
- 1968-S Washington Quarter Proof Set: The 1968-S quarter was also included in the 1968 proof set, along with other proof coins from that year. Proof sets are typically more valuable than individual coins, especially if they are in good condition.
Note: The values mentioned here are approximate and may vary depending on specific factors, such as market conditions and the actual condition and variety of the coin. It is always a good idea to consult a reputable coin dealer or online resource for a more accurate appraisal.