no
It may be a Mint error only in that the coin is an uneven thickness, in which case it would be a planchet error. If the coin is not damaged otherwise (excluding the bubble), though, then it's probably not a provable Mint error. The bubble is probably a lamination problem, which can also be a planchet error. This occurs when the cupro-nickel layer (the "silver" colored layer) separates from the copper middle.
A good 1995 error quarter can be woth up to $20 in good condition
The value of a 1967 Liberty quarter, more accurately known as the Washington quarter, typically ranges from $3 to $10, depending on its condition and demand. If it is in uncirculated condition or has special features, such as being a rare error coin, it could be worth significantly more. Always consult a numismatic expert or reference a current coin pricing guide for the most accurate valuation.
to remove the air bubble, which are made error in volume. S.Kailash
$25
Throttle switch error
A good 1995 error quarter can be woth up to $20 in good condition
This is called a 'Lamination' error and a statehood quarter with this error is worth $50.00.
You didn't say what mintmark but a 1854 seated Liberty quarter is worth this: Good-4: $20.00 Very Good-8: $25.00 Fine-12: $35.00 Very fine-20: $45.00 Extra Fine-40: $85.00 Almost Uncirculated-50: $225.00 Mint State-60: $500.00 There is an error where the O mint mark is larger than usual.
hard to tell. could be the minnasota extra tree error but probably the 3031 quarter
The 'Eagle Reverse" was last used in 1998 for the Washington quarters. Look at the reeding on the edge of the coin. You should see a seam an the reeds won't mach up. This is NOT a U.S. mint error coin. It has been altered and has no numismatic collectible value.
Value depends on what kind of error. please be more specific