Mint Marks: Look for mint marks like "P" (Philadelphia) or "D" (Denver) on the reverse side near the eagle.
Bicentennial Design: The reverse side of the coin features an eagle, a design that was common during the United States Bicentennial in 1976 and continued into 1977 and 1978.
Collectibility: While not particularly rare, collectors often seek out coins in excellent condition or with interesting mint errors.
Errors and Varieties: Some 1978 quarters may have errors such as double strikes or misaligned dies, which can increase their value.
Condition Matters: The condition of a 1978 quarter greatly affects its value; uncirculated coins are generally more sought after.
Value Guide: To determine the specific value of your 1978 quarter, consult a trusted coin value guide or consider getting it appraised by a professional numismatist.