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hpw12
02-09-2012, 06:35 PM
I have 81 loose mint set quarters that I would like to purchase from an individual and they all sound and look like silver.

Is here a way to determine which ones are silver and which ones aren't. I

know there are clad mint sets and 90% mint sets. Does the mint mark "S"

signify that they are silver:confused:

Buster Brown
02-09-2012, 06:52 PM
Weigh them. Google for the proper weights. I know with many half's this is the only way to tell so I assume quarters are the same.

hpw12
02-09-2012, 07:22 PM
thanks Buster, now
can someone interpret this for me
Silver Proof Content:Cladding 80% silver 20% copper, COre 20.9% silver, 79.1% copper
Doesn't sound like there is much silver in it at all.:confused:

flhtquick
02-09-2012, 07:26 PM
my 1999 quarter set says 90%ag 10%cu 6.25gms

NCCPC
02-09-2012, 07:26 PM
I believe that is the description of a 40% Ag coin, such as the Kennedy Halfs of 1965-70, the silver Ike Dollars and some Silver Clad Proofs.

hpw12
02-09-2012, 07:45 PM
weighed them all, 11 weigh 5.9g and the rest weigh between 6.2 and 6.4 grams.
The 11 all turned out to be the Bi-centennial 1776-1976 quarters

Would it be safe to assume the heavier quarters are 90%silver based on the weight?

NCCPC
02-09-2012, 07:55 PM
Quarters dated 1965 or later are all copper-nickel clad coins except for the dual-dated Bicentennial Quarters that were sold by the Mint in special Mint Sets and Proof Sets. These quarters contain 40% fine silver and have an "S" mint mark. They are different from the Bicentennial quarters you can find in circulation and were sold by the Mint at a premium to collectors.
Source (http://www.coinsite.com/content/faq/ussilver-coins.asp)

If the Bicentennial Quarters have an S mint mark, they're 40% silver.

mbeded
02-09-2012, 08:07 PM
hold them in your hand as a group and just look at the edges. the silver ones will be silver and the clad ones w/b copper.

I have 81 loose mint set quarters that I would like to purchase from an individual and they all sound and look like silver.

Is here a way to determine which ones are silver and which ones aren't. I

know there are clad mint sets and 90% mint sets. Does the mint mark "S"

signify that they are silver:confused:

NCCPC
02-09-2012, 08:26 PM
^^ True. But, with 40% Ag coins you will see the primarily copper core. So far as I know, the only 40% Ag quarters were the S mint Bicentennial Proof & Mint Set issues. They were 3 coin sets ... quarter, half & dollar. I have a couple of those.

Aside from that, post 1964 are Cu-Ni, pre 1965 are 90%. Of course, 90% isn't clad and so there's no copper visible on the edge.

coindog
02-09-2012, 09:28 PM
Source (http://www.coinsite.com/content/faq/ussilver-coins.asp)

If the Bicentennial Quarters have an S mint mark, they're 40% silver.

the clad proofs also have an S mintmark so that's not the factor that matters.

NCCPC
02-09-2012, 09:41 PM
OK, I did a little more searching and found the weights which should clear it up for the OP, since he has a gram scale.

(90% silver) 6.25 g containing .18 troy ounces of pure silver,
(clad) 5.67 g,
(40% silver clad) 5.75 g

Source (http://en.wikipedia.org/wiki/Washington_Quarter_%28U.S.%29)

Although, the difference between Cu-Ni clad and Ag clad is only 0.08 grams, if your scale is only precise to 1/10th g, it should do the trick. :)