1967 Flat washington quarter?

Found this discussion, kinda explains it. Looks like copper is not dissolved in normal acids, takes aqua regia.(Mix of NI and HCl acids)
http://www.scienceforums.net/topic/9307-dissolving-ni/

 

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Just some food for thought...

My initial impression was acid dipping also, but if the weight is in fact 3.1 grams, things just don't seem to be adding up. Clad quarters are 91.67% copper and 8.33% nickel, distributed in two components, one being a .75/.25 copper.nickel outer layer engulfing a pure copper core and the other being the core. I was unable to find the exact mass of the inner core, that would be a useful piece of information. Anyhow, with a penny planchet from 1967 weighing 3.11 grams, it seems plausible that it was struck on a penny planchet. It is also perfectly plausible that a clad quarter was dipped until it was the correct weight, but I think this could use some reconsideration. The weak reeding could be attributed to acid dip reducing the size of the 'mountains' whilst maintaining the size of the 'valleys,' but couldn't the reeding be reduced by a copper penny planchet, upon being struck, barely stretching out to the collar and thus producing weak reeds? What about the apparent off-centering that is present; wouldn't this be an indicator of a haphazard stretching of the penny planchet exploding outwards into the quarter collar after being struck?

My guess if it's not struck on a copper planchet: Acid dipped until the correct weight, then smashed with a hammer to produce the big ole dent and the warping of the circular shape.

Are you sure thickness/clarity are 100% distinctive indicators? Here are two acid dippers, the first with an fairly thick planchet and the second with some degree of distortion.





And by the looks of Collect89's variety of this error, the strike can be very, VERY crisp.

 

Here is a picture of it sitting directly on top of a regular washington quarter.:smile

 

Seems like the amount of material missing between the two specimens is no where near the necessary 2.57 grams that would need to be removed to reduce the weight... anyone else want to 'weigh' in?

 

If you look at the most recent picture, the coin in question fits inside the inner rim of the normal coin. so it is significantly smaller in diameter. Next, on a genuine quarter that is missing a clad layer the weight is typically close to a gram low. If this has had both layers dissolved away it would be two grams low. The smaller diameter would account for the rest of the missing weight.

 

We have one and it is 1967 too. It weighs less than 3 grams. It is very very thin. I found it among my father’s coin collection. The design is detailed on front and back.

 

We have one and it is 1967 too. It weighs less than 3 grams. It is very very thin. I found it among my father’s coin collection. The design is detailed on front and back.