It depends on what your definition of "flawed" is. If a person fell into a coma in 1963 and woke up today, he'd be pretty old, but he'd also remember when quarters were silver and passing slugs would land a person in jail for counterfeitting. He would condemn not just some few items out of the lot because the picture on it didn't come out right, but all that spills out of the mint today, as flawed, as entirely counterfeit because it contains no silver. He'd be a different kind of person and he'd wonder what in hell happened to us, to fix in our minds the idea that counterfeit money, is the real money, and that money not counterfeit is an anachronism that belongs in antique coin shops, and that counterfeit money is money not produced by the government authorized counterfeitters.
Of course the hundred dollar bill also contained a hundred dollars worth of paper in 1963 ...
Prior to 1967, silver quarters were "slugs" as the silver was worth less than face value.