two 1999-p clad layers missing?

i found these coin roll hunting. i realize clad coins are made of cupro nickel, and it looks to me as if the coins are missing the nickel part and were stamped with just the copper part. am i right and how much are they worth?

 

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They look more like they were used in a science experiment or have seen some very harsh conditions. I'll let the error experts chime in. But I wouldn't get my hopes up.

 

Looks like environmental damage. (Strike and details are too strong for a coin missing both cladding layers) If you really think it may be missing both clad layers the first thing you need is an accurate weight. If it really is missing the clad layers the weight should be around 1.2 grams.

 

Looks to me like someone found them on a boat or underground

 

Environmental damage.

 

Conder101, if a dime with no clad layers weighs1.2 grams what is the + or - it could weigh? Where did you find that info. It would nice be able find the info. for dimes, quarters and halves. Thanks

 

I think that a dime with no clad ( just the core) should weigh about 1.52 grams +/- based on nickel and copper having very close to the same sp. gr. ( Ni =8.930, copper = 8.800 ). This page from the USmint, gives the specifications.

http://www.usmint.gov/about_the_mint/?flash=yes&action=coin_specifications

so if nickel is only in the clad part and is 8.33% of the total weight 2.268g = .1889 grams of nickel. since clad has 25% Ni and 75% copper, the weight of the copper in the clad layer is 3x .1889 = .5667 grams for a total clad weight of .7556 grams.

A cladless copper core should weigh 2.268g - .7556 grams or 1.524 grams +/- tolerances.

Tolerance is harder to calculate as it is for the weight of the entire coin, not just one part ( clad, core), so I would say that the tolerances ( +/- 0.09 grams) which = 3.968% ( most gov figures use rounding to 4% tolerances), a "core only" unclad dime should theoretically be the 1.524grams +/- 4% ( +/- 0.061) or a ( 1.463 to 1.585 ) range.

If one wanted a more accurate estimate, then use the specific graavities in the calculations, Just seemed a little too much for me as I do not feel that is the case with this coin from the photos.

jim

 

thanks, i know more today then i did yesterday so today wont be a total waste of time !!!!!!

 

Pmd.