Examine the front of the coin for the date 1776-1976. Check for the distinctive double-stripe design on the obverse side.
Inspect the reverse side for the image of a drummer boy. Look for any signs of wear or damage that could affect the coin's value.
Use a magnifying glass to examine the coin closely for any mint marks or errors. Compare it to authentic images of the Bicentennial Quarter.
Consult with a professional coin grader or numismatist to authenticate the coin. They can provide expert opinion on its condition and value.
Consider getting the coin certified and graded by a reputable coin grading service. This will add credibility and value to your $90k Bicentennial Quarter.
Store your authenticated $90k Bicentennial Quarter in a protective case to preserve its condition. Display it proudly in your collection or consider selling it to a collector.