Error quarter? 0

[Ratzie33]

Weighs 5.3 grams. Edge looks like a layer of copper sandwiched between two layers of clad.

[Ratzie33]

Doesn’t appear acid dipped

[Just Bob]

It is a touch underweight, but that is likely due to metal loss from wear.

And, since 1965, all US quarters minted for circulation are two layers of 75/25 copper-nickel, clad on a copper core.

Edited October 9, 2019 by Just Bob
clarity

[Conder101]

And it may not "look" acid soaked, but it is.