Discussion in 'Error Coins' started by Marc Peagler, Jul 15, 2019.
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It has the outer clad layers and copper core,
you just can see them due to the plating of it.
Silver Quarter -> how to ID
When a quarter which is expected to be cupronickel clad is found without a visible copper core, when viewed from the edge, the question becomes “Is it silver?”
A few 1965 silver quarters do exist, but are quite rare: https://www.coinworld.com/news/prec...steve-roach-numismatics-collecting-hobby.html
A 1970-D Silver Clad Quarter also exists with the copper core not visible on the edge.
Most likely the quarter has either been plated as a novelty item after it left the mint, or a dull punch has pulled the cupronickel cladding over the edge while punching blanks from the coil.
The weight of a Silver Clad Quarter, adjusted for tolerance, is too close to the weight of a Nickel Clad Quarter, adjusted for tolerance, to identify the type of cladding.
Quarter 1947-1964 = 6.250 g +/- 0.194 g (900 Ag 100 Cu)
Weight of Clad quarter 1965 – to present = 5.670 g +/- 0.227 g (75 Cu, 25 Ni on pure Cu)
(1976 = 5.750 g +/- 0.200 g - 40% silver clad)
A specific gravity test can tell, but it is difficult to run one accurately. Specific Gravity Test. 90% Silver = SG 10.34; 40% Silver = SG 9.53 Cupro Nickel clad = SG 8.92 Copper Cent = SG 8.83; Zinc Cent = SG 7.17; Steel cent = 7.7
Here are instructions about how to perform a specific gravity test:
http://lincolncentsonline.com/Copper Or Zinc.html
Another alternative to determine metal content is via an XRF Scan.
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