WILMA MANKILLER 2022P quarter sound error?

Dropping a coin for a sound test is a good way to damage the coin. It’s also a very unreliable.

 

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I have used the "sound" technique a couple of ways...dropping pennies on a hard surface to separate Zincolns quickly and holding a suspected silver coin lightly between thumb and forefinger and either tapping it with another coin or blowing sharply on the edge to hear it ring. Neither way is 100% assured, and with the sandwich type of manufacture, who knows what stresses could be set up to give different results. I think about all that can be said is that it is not anything that has been reported or seen by members here who are pretty knowledgeable. It is interesting but only worth what you could get someone to pay. Don't take anything personally from any of our posts. PS, I would hang on to it as a curiosity and perhaps ask some dealers either at shows or shops...it would be a very specialized thing.

 

OK, I watched/listened to your YouTube and they all really sound pretty much the same to me. What kind of surface were you dropping them on? Try a glass or metal surface and drop on the edge.

 

Thomas a drop test is the least reliable of any test. it also has the potential to reduce the value thru damage if it does turn out to be some kind of wrong metal.

There are too many variables when trying to come to a conclusion from a drop test.
First a lighter or heavier planchet.
Second could be a cladding that did not bond to the copper core.
Third angle of the coin when it hits
fourth a surface that doesn't have the same density. (IE) a dashboard of a vehicle. Think of a drum. At the edge you get a different tone than if you hit the center. The reverberation has a different density.

All the above reasons are why we do not use a drop test when trying to attribute a coin. It is not only destructive it never leads anyone to a definite conclusion.

 

Looks like you are dropping it on something plastic, like a cars center console. That's no acceptable way to hear a difference. a good, solid wood table is best.
BTW Welcome to Coin Talk and you will find this spot a wealth of information from some very experienced members.
I have no idea where you live, but it you can find a local coin shop, or a jeweler that has a XRF machine, let them tell you the exact composition of the metal in the coin.